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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.
And in extension, how does paying prevent you from being the product then?
Worst case: You pay and are still the product. Less worse case: You pay to prevent being the product, but never would have been the product anyways.