A good point. You could call all those "end of our incredible journey" posts "rugpulls", except the investment isn't financial but the investment of your data on a platform which gets deleted. There are a few extra steps in "Vine sell out and now all your vines are gone", but the overall effect can be similar. Founders cash out, users lose out.
Somehow it's difficult when people invest actual cash money, especially in large sums.
Companies like Reddit are the exception to the norm in many ways. They’re almost this weird experiment in “what happens when a built-to-sell startup decides to stick around?” Hell they sold to Condé Nast and lived there for years as just a part of the portfolio. They were in the red for roughly a full decade.
That whole arc is weird now that I think about it haha