This sounds all true, but on Twitter - I never had the issue before so it seems more than a coincedence.
In fact, I used to be very surprised to read that Twitter had been previously widely used for porn adverts. I was kind of deluded into not even thinking about it. But scratch the surface and it was there. But it never appeared in my daily use.
Prior to the takeover I had been oblivious to it. After the takeover, the surface was scratched and what had previously been "underground" really made itself known in my twitter feed.
That isn't what made me leave the platform, but just my observation at the time.