Quantity is quality, if you have good filters in place.
I never understood people that argue something is bad by looking at the median case. The problem of Reddit, Twitter and Facebook is not due to the amount of people they have, and they were absolutely fine until they tried to exploit their userbases.
(Aside for @blaze: see what I mean about Fedi’s anti-growth and reactionary culture? Our friend here is not an isolated case)