OSM Wiki has huge number of images with unclear copyright status, and ideally we would replace them with images that has no such issues.
See for example Category:Media without a license - OpenStreetMap Wiki if you want to help.
If you prefer to not deal with any copyright (which is a good thing for mental health) you can look through Wikimedia Commons to find replacements for specific images listed in this thread.
You can either edits OSM Wiki directly to replace old ones. You can use Wikimedia Commons images directly on OSM Wiki, and all images following their rules are safe to use.
You can also edit file page at OSM Wiki to link a potential replacement.
Or just reply in this thread with a proposed replacement which will be already helpful.
Look at the ned of thread ( Finding new images for OSM Wiki - help welcomed! - #19 by Mateusz_Konieczny right now ) to see images where replacement is needed.