They hook you into an ecosystem. That’s it, thats the game. I don’t think it has too much to do with insecurity. Group chats and video chats with people outside of imessage is awful. Group chats lose a lot of features because SMS was all there was for a long time. Standard (not Google-ified) RCS is still too bare at the moment so I don’t think the looming rcs fixes that aspect of it.
Probably the people—accurately—pointing out that Mozilla has also adopted Manifest V3 along with Google. Google is doing it to curtail (“kill”) ad blockers. Mozilla is also now in the advertising game, and secretly began a telemetry program which is opt-out only. And, given how we shouldn’t trust orgs with financial motive, very well could opt you back in with future updates exactly as Microsoft does.
Plus, their current CEO has a history, and Mozilla as a whole faces dicey times ahead if their Daddy Google is forced to stop buying exclusivity deals by the U.S. government.
So take your pick I guess.