

Note that if you’re in the US, Samsung doesn’t unlock the bootloaders at all and afaik Motorola is also hit or miss. Importing a phone is also risky as international versions might not have the cell bands required for US carriers.
If you want a custom ROM in the US you basically have to buy a pixel, and at that point you might as well go with GrapheneOS since it’s the most secure
They haven’t stopped it yet for the pixel 10s but who knows how long it’ll last