I don’t want to do this conversation here, but i can tell this. Its not that simple. (I am talking about Geodata data).
This “License issue” its not that simple as just using the phrase “incompatible attribution requirements and other terms”, and say that it is not permitted for use in OSM.
Every country’s courts have different definitions of CC terms of license usage, and these definitions primarily depend on the context of that usage.
Of course i can understand the OSM LWG precautions (mostly about attributions), because the are trying to close any legal “back doors”, but i think they go a bit extreme.
Anyway, i don’t think there will be any court that will convict OSM because of Geodata usage in its context. (free context is important)
There are more, but as i said, i will not continue this conversation here.

EDIT: As for oasa. things go even deeper, and there are “fair use” and “substantial republish/reproduction” terms of use, that are defined in courts.
For clarifying things, “personal use only” means free for “fair use” and prohibited “substantial republish/reproduction”. But final definitions of “fair” and “substantial” are given only in courts. (again context of data usage is important).