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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.
I sometimes pay for things and still end up being the product. Smart TVs sell tons of data, and you may still pay buckets for one. YouTube Premium is no guarantee that Google won't use your data in other ways. A modern luxury car has tons of ways to spy on you.