You underestimate how little money such a dlc makes. It’s the same reason why the promised SP addon for GTA 5 was cancelled. Return of investment is magnitudes higher for any GTA online content. Making a new car model is little effort and brings in millions of dollars.
Having to deal with story, level design, voice actors and possibly animators or even Mocap: soooooo much more work. Sure they could do it, and even Earn good money with it. But online pay dlcs are so little effort for so much more payout , why even bother?
Rockstar hated what FiveM did, even threatening them at the start because they were afraid it would compete with their own online service. And now they bought them up, but only after realizing how much more people ( or rather their wallets) they can possibly reach.
What’s your source on the reverify thing? I use matrix a lot, and this hasn’t been an issue I ever experienced anymore since they introduced cross-signing a couple years ago.
Same goes for the common clients such as element. It has been clunky in the past, but after the past major overhauls ( also years ago now) everything has been silky smooth for me, if not better than others. The one thing left I prefer from Signal is the one-time photo share.
Matrix is great, clients are great too, only the server part still is annoyingly complicated and messy. Would only recommend that for tinkerers, on that case it’s a great path to learning about the complexity of addressing lots of security concerns that others gloss over.
Edit: to add - there’s a reason why the French government and the German military decided to build their secure internal IM infrastructure on Matrix. Obviously they are hosting their own private network, but if the concept is good enough for European government and military, it is an indicator for quality especially in terms of security and privacy.