I think this is an eternal cycle. Maybe related to what has been called "enshittification", but not the same:
Users will flock to a platform, make it their own. The platform will grow. Then the advertisers, professionals, and hucksters will swoop in, do their thing, and slowly overshadow the old "normal" users. Then old users will leave, leaving a wasteland of ads and glossy shiny.
Users will flock to a platform, make it their own. The platform will grow. Then the advertisers, professionals, and hucksters will swoop in, do their thing, and slowly overshadow the old "normal" users. Then old users will leave, leaving a wasteland of ads and glossy shiny.
I'd like to call it "glossification".