The modules/transceivers are unlocked there, but the switch ports may not be. Mikrotik doesn't vendor lock their ports, but the bigger manufacturers do. Some places sell transceiver programmers, but those are locked to their own modules (I think that may be due to a technical limitation). So fs.com's modules can be reprogrammed with FS.com's fiber box thing, and ubiquiti's modules can be reprogrammed with their Ubiquiti Fiber Wizard (I think that's the name of it?).

My switch has vendor locked ports, and there's a console command to disable the lock, but I'd have to beg the manufacturer for an unlock key (it's based on the switch's serial I believe) for a key, and it's a used switch, and they are not a fan of people using their OS on used switches since their license entitlements are non-transferable. So it's FS for me, and if my next used switch is a different brand I'll have to shell out for their reprogrammer.