As far as I can tell, the Bluesky CDN blows the image up so the longest side is a multiple of 2000px, then it converts to JPG (Q=100), then it iteratively reduces Q by 10 until it gets the file size under 953KB, then it downscales to the requested size.
Don't know if you ever got an answer to this, can't see the one reply (guess I'm blocked or something) but no, links don't influence the algorithm on here, no words like patreon affecting it either
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man this image compression sucks tho huh
Feel free to post links, use hashtags, and leave words like "Patreon" and "commissions" uncensored!