It's even more trivial to remove the hard drive and read/write it directly, possibly even booting it on a separate system directly or in a virtual machine. BIOS passwords (on all x86 systems, not just Lenovo) provide very limited security benefits, but they can be sufficient for some basic security requirements.

See https://github.com/maltfield/awesome-lemmy-instances. That list of "random instances" is updated frequently from awesome-lemmy-instances.csv.