Do they allow it? I was surprised the Huawei Mate 20 Pro, at the time a flagship phone on par with the Note 9 and others, actually had a locked bootloader.

It would've been a good opportunity to allow people to install whatever they want, to show that they're different than Samsung and other competitors, but no, they went and locked that down because of "safety". Mhmmm.

It's a little bit of an ordeal - you have to request a bootloader unlock and then wait two weeks. But doable.