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A reminder in the age of the Fediverse: if you're not the customer, you're still the product.
(slrpnk.net)
OP was taking about Tumblr, but I think it applies even more to the Fediverse: users need to develop an ethos of paying to support the sites they use. Otherwise advertisers pay the bills and call the shots.
Lemmy is different I think. I was donating until they started defederating from stuff like piracy groups.
They should ask for more money to fund servers / lawyers to make the community stronger which will attract more people and money.