For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.
i didn’t deal yet with any MacBook 2018 that could have an iCloud lock,
I will buy some MacBook untested and not sure they have iCloud or not
how to check the MacBook iCloud state ? could it be unlocked?
You can't without access to the machine, or get cozy with an AASP who can check it for you.
Also if it is locked it can go in the trash. Basically the same as iPhones now. You can still swap the CPU though, iCloud is only tied to the T2, ROM, NANDs, EEPROM.