Well, I guess there's also recordings with a line-in from a mixing console with the mics&pre-amps on the other side of that, and sure, that's a thing, and I ignored that with my comments. That setup gives you just-about-good-enough quality (certainly way better than ye olde "direct from desk" bootlegs of past time).

I was thinking more of setups where you connect a mic/pre directly into the phone.

Most of the time I've seen people doing this, however, they are using "native" recording apps on their phones, not a browser.