Ripping Blu-Rays as is makes little sense except for preservation as most of them have hardcoded black bars in the video stream instead of letting playback devices letterbox/pillarbox as needed. Apparently the standard only supports a few resolutions, not even including 24:10 and other common cinema aspect ratios.

Also still plenty of Blu-Rays around using VC-1 which is garbage compared to current codecs. Perhaps all new ones have migrated to H.264 - at least all UHD ones I have seen have.

webm is matroska (with limits on what you can use) so it actually has seen quite a bit of commercial use.

You get all of them, since they tend to be ripped as-is from the source media. I commonly see Dolby Digital+ (because Netflix/Prime/etc. use them), Dolby TrueHD (because BluRays use that) and nowadays there's more and more Atmos.

Ocassionaly you can see an odd DTS/DTS-MA now and then, but not a lot.

Personally I see a lot of AAC/AAC+ and some Dolby Digital.

Well, pirates don't care about licensing of audio or video formats, but most do care about fidelity. For audio, generally, whatever source was is used: Dolby Digital+, Dolby TrueHD, Dolby Atmos, AAC or AAC+ if source is wack.

Porn uses old and free formats for maximum compatibility. h264 and aac, works on every budget device from the last decade (and older). Even the highest quality 4k porn is just 20 mbit/s h264. These companies aren't youtube, they don't encode every video in 10 different formats for every use case. If pornhub statistics are to be believed, like 85% of visitors are mobile users. There's no point in optimizing anything for expensive big screen great audio home theater experience when your target audience is 5" low res screen 1% volume ashamed at night phone fappers.

The very opposite of cutting edge technology (with the exception of tiny niches like VR).