Communities can thrive or fail depending on who is in charge.
(What happened with regard to the mod banning an artist because they thought their art looked like it came from an AI? Last I heard the artist was able to show their workflow but the mod was unwilling to back down…)
TD was quarantined under false pretenses (ironic ones too, since a very pro police sub was accused of being anti police) and then basically killed while pretending it was alive.
KIA is alive but heavily muzzled by admins on some topics such as a prohibition to mention trans in any shape or form. The mod takeover was because the original founder who didn't use the site took over it once and destroyed it something.
There's been other cases where founders wreck havoc after years of not being active and were removed.
Problem solved.
No one has left twitter, despite Elon's tantrums.
Do you really think CEOs care when their site has so much momentum and mods can be replaced in a snap?