Nope. YouTube, for example, works like a charm. Settings allow users to select a user agent (chrome, edge, firefox, safari) or set a custom one.
YouTube isn’t really known for their bot protection afaik. You’re able to get through the Cloudflare interstitial and fully solve/submit hCaltchas? They run actual JS fingerprinting which is where I think something like this would show
better said youtube does not block most bots on purpose, they do work after to cleanup botted engagement after the fact