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Does Vimeo compresses the uploaded videos? I found their videos to be more "clearer" if that makes any sense.

All video is compressed in a lossy manner.

I have some 444 10 bit progressive files, you could argue that the mere act of sampling an analog domain is lossy, but if you accept a typical YUV422 as being non-lossy then I have a fair amount.

But yes you're right that typically video today will be stored in the 150-250mbit range which is lossy.

I imagine a typical youtuber will then compress that again out of their video editor to something like a 20mbit long-gop file and upload to youtube/vimeo. That platform then takes the original upload and makes a dozen or so versions and different frame sizes, bitrates and codecs to cater for different consumers

Maybe he means lossy compression

That 3gbit is already lossy compression (chroma subsampling, bit depth compromises, framerate and size compromises)

You could store at a more usable bitrate - say 240mbit, and its even more lossy

I guess hulitu meant to say "very, very aggressive compression with rather noticeable artifacts and banding which are hard to ignore even for a layman"