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Probably 10-40% of what your browser is served nowadays is brotli, it's in Chrome so all the major CDNs support it by default

I’m sure you’re right, but files-on-disk is another story. I was referring to the latter.

Jpeg-XL makes use of Brotli, and once it hits 1.0 it will most likely be turned on by default in browsers and thus you will probably see a lot of jxl in the wild, particularly since it provides lossless recompression to existing jpeg files with ~20% smaller size as a result.

It’s definitely in use by Meta and Google.

I'm not the OP, but I took their comment to mean "on the command line".

cloudflare uses brotli (not sure if optional or by default)