In the last 15+ years we have heard this same story, "X platform wouldn't exist without Y user". This has never turned out to be true for any large scale social media platform. For the platforms that have failed, it was always a better platform that took their place, not one single user causing a mass migration.
Look at the_donald, which had a mass migration off of Reddit, and everyone said Reddit was going to shutdown without their ad revenue. Still waiting...
