> They haven't produced polarization, radicalization, scams, privacy issues like Facebook, Youtube or Twitter.

You must be reading a different Stack Overflow, then. SO has had

* a grand leak (or series of leaks),

* revelations about spying on users with ads,

* polarization between the company and power users/moderators,

* a radical scandal over pronouns and thought policing, with a SO top manager spewing libel against an ex-mod in an interview leading to an out-of-court settlement,

* and overall decline of quality across the board.