cracked servers (that dont need a microsoft account and dont use their authentication) are quite common, in fact you dont need “patched” server software to make one, it is literally a setting in the default microsoft provided server!
you would want some sort of in game authentication through a plugin (spigot, bukkit, etc) to prevent people from claiming to be your username and the server blindly trusting them and getting your stuff stolen though.
cracked servers (that dont need a microsoft account and dont use their authentication) are quite common, in fact you dont need “patched” server software to make one, it is literally a setting in the default microsoft provided server!
you would want some sort of in game authentication through a plugin (spigot, bukkit, etc) to prevent people from claiming to be your username and the server blindly trusting them and getting your stuff stolen though.