Right, there isn't a "list", but if you run the FCC ID on the radio, it will tell you what sections it is approved for. This has been beaten to death, the GMRS rules clearly state that to use a radio on GMRS it must have part 95 acceptance.
Yes, but there are relatively few radios specifically listed as GMRS type approved. Most UHF part 90 radios meet the same technical requirements required for part 95 approval, but have never been submitted.
Part 90 radios have been used in licensed part 95 installations as far back as I, or anyone else, can remember.
Of course few bother to follow the rules, so it's a moot point.
In this specific case, yes... there are a lot of people not strictly following the rules. The FCC is well aware of the fact that they have created a Catch 22 situation... the requirement for type approval for Part 95 radios, and an egregious lack of Part 95 type approved radios available for use.
So long as one is operating within the specific technical standards (TPO, frequency stability, BW, etc.) I would challenge you, and everyone else, to show a single documented case where someone was cited for using non-type approved equipment in Part 95.
You won't, because they don't strictly enforce it. A moot point, indeed.
My suggestion to anyone contemplating running on GMRS is, if you want an excellent but inexpensive radio, a Spectra would top the list. The FCC isn't going to bother you one bit if you do.