I suppose it is determined by where you set the bar, even more so with privacy which still varies person-to-person and can sometimes take a qualitative feel.
Security wise, there is interesting work adopting MLS (and I believe key transparency) under Matrix, see https://arewemlsyet.com for example.
Security wise, there is interesting work adopting MLS (and I believe key transparency) under Matrix, see https://arewemlsyet.com for example.