You could either contact them via one of the methods on http://maps.me/en/home or write to the OSM talk mailing list which is followed by one of the devs, as you can see in e.g. https://lists.openstreetmap.org/pipermail/talk/2017-July/078273.html
In my view, maps.me is one of the biggest causes of bad data this year.
I think they urgently need to solve the problem of the lack of effective accountability. Unfortunately the only way of doing that would probably be for one of their staff to review changeset comments on their edits that don’t get a response within, say, a week, and I doubt they would have a viable business model if they had to do that.
IMHO, not only added bad data to the database, but also show “bad” data to their users, since they are offering an advertising service to POIs, so, when you search for something, which will came first, the bests items or the sponsored ones?
I looked a bit more into this, and wow. Sorry for straying a bit off topic, but maps.me is slowly destroying the middle east. This is very serious. I assume the experienced mappers of Europe / USA have kept things in check. But there are considerably less dedicated mappers in the middle east. Overpass is not even needed, just browse a major city for a while.
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Damascus, Syria. Camp sites everywhere. (some are legit but mistagged).
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Lebanon, Beirut, Pharmacies, lots of them.
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Iraq, Baghdad. Personal guest_houses, shelters, caravans, in all directions.
Taking that Baghdad link as an example - there’s nothing else there, and people are filling in the map the only way they know how!
Maybe if someone who spoke fluent Arabic could try and get in touch with them they might be able to convert a small percentage to “mapping properly” 
Also - just in case you’re not aware - you can use http://mmwatch.osmz.ru/?country=Iraq to highlight (and revert) MAPS.ME edits on a country by country basis.
Added to wiki https://wiki.openstreetmap.org/wiki/Quality_assurance#Monitoring_tools Quality Assurance Monitoring Tools
I’ve deleted hundreds of personal houses. But now I’m wondering:
Certain areas of the world have no addresses for various reasons. What if this is helpful for people to navigate, where names are kind of ad-hoc replacements for addresses?
Maybe I’m over-thinking this and it’s just reckless maps.me edits, but I don’t want to reduce the map usability to anyone.
It seems I had at least a single false-positive: http://www.openstreetmap.org/note/1070780
I’ll stop deleting until/if more people from those regions explain things or discuss this.
I will keep deleting the blatantly obvious: My house, My uncle’s house, etc.
I wonder if some kind of “legal amenity” tagging would make sense for some of these - somehow indicating that “here is the location of someone who can mediate in a dispute”. MAPS.ME displays the name for http://www.openstreetmap.org/node/2866177983 (which is an “amenity=solicitors”) and https://www.openstreetmap.org/node/4451574496 (“office=solicitors”). I don’t think that “solicitors” is quite right, but maybe a different one from https://taginfo.openstreetmap.org/keys/office#values might be?
I’ve decided to keep deleting. I am confident most edits are personal. And if some place is important as above, I’ll likely be contacted (or I’ll notice it’s been readded again and again or edited by different people).
I decided to create a dedicated account for QA. There’s simply too much work to be done and my main edit history was getting crowded. Maps.Me devs have to do something about this.
This forum will probably get limited attention, maybe you want to bring this up on talk mailing list, where similar maps.me issues were discussed recently.
Thanks. I think I will try the app for a while, come up with specific suggestions, explain the middle east mess, and post on the list.
Are we absolutely sure I should delete “X’s house”-style points and they’ll never be wanted in the future?
I’m still deleting about 10 - 100 weekly in WB/Gaza strip (I gave up on the rest of the middle east. too much work). Most them are guest_house named “X’s house” where X is some personal or family name. But I’m a bit uncomfortable with this because if sometimes in the future it’s decided they’re wanted, it would be an extremely time consuming revert.
For the record: I concluded almost all of these strange additions are in fact people all across the Middle East adding the houses of people they know (and sometimes phone numbers) as guest_houses, alpine_huts, caravans, or anything with a pretty Maps.Me icon.
I simply gave up policing the region.