When, not if, element crashes (android or webapp or desktop, all do that), you get logged out and in order to access encrypted groups (dms are encrypted groups with 2 members) you need recovery key, or room keys (you can export them). If you have exchanged keys in person, then the first one recovers it too, the second doesn't
Matrix lacks some of discord features, but the point is encryption it provides
a16z funds 1000+ strong phone farm and uses it for mass manufacturing tiktok ai influencers, security turns out to be not good enough https://www.404media.co/hack-reveals-the-a16z-backed-phone-farm-flooding-tiktok-with-ai-influencers/
the usecase is spam: