Also Tumblr isn't a charity, they are a for-profit company.
Do you want them to steward the fediverse, maybe include a few ads here and there for the privilege of their participation?
I think they will soon realize the cost-benefit analysis doesn't correlate to their bottom line.
People over profits, don't settle.
@dansup Tumblr users sure think it's a charity. They riot whenever the company tries to do anything to staunch the millions of dollars it loses every month.