That's no excuse for YouTube because (a) audio processing can be done in JS/WASM and (b) they have the influence to improve browser playbackRate implementations to something better [1].
Besides, their Android and iOS apps do slow music as bad if not worse than on web.
Besides, their Android and iOS apps do slow music as bad if not worse than on web.
[1] https://bungee.parabolaresearch.com/compare-audio-stretch-te...