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To buy no longer means anything :(
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Maps aren't servers. They're just maps as in any other videogame. You can play maps offline and with local multiplayer.
Most servers aren't related to Microsoft, but they also use the default server software which requires proper authentication. Now that Mojang account servers are down you can't log in with them anymore. One'd have to use patched server software that completely turns authentication off or uses an alternative authentication server to allow people without Microsoft accounts to join.
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.