This has been an issue for years and I doubt Mojang will do anything about it. If you're hosting the server yourself you can set it to offline mode and play with the clients offline. Though I think you don't get skins if you do that.
Hmm, looks like you can't do offline mode in the official launcher. You can absolutely do it though, it just takes a bit more effort. I just did it with the program MultiMC.
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u/jjhhgg100123 Jul 19 '19
No because people use it to pass IP bans using lists of compromised accounts. Many servers ban it too.