Bluesky is a proprietary service operated by a single company, but with an unusually good "API" for plug-in 3rdparty tools.

mcc

Bluesky is a proprietary service operated by a single company, but with an unusually good "API" for plug-in 3rdparty tools. As with other sites that previously had "API"s, that API remains valid only as long as—and only in the ways which—the parent company feels like them being allowed to work. https://oldfriends.live/@paul/113541079428044213

If you read the bluesky developer documentation, you'll find lots of verbiage asserting something different from the above. But I assert my frame is closer to accurate than theirs