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You're looking at that pre-covid time with rose tinted glasses. Half the reason sites like reddit or twitter offered free/open APIs was to ensure that the bots were being as efficient as possible rather than hammering the sites (The other half was altruistic but that good will is a very small line item to an MBA). Scrappers got so much better at just going to what's presented to humans because these kinds of APIs are no longer common so they had to. So now the lazy option is to no longer check if a site offers an API, rather than to check if it did and save time / not worry about maintenance by coding for an API.