I found a glitch by which I can bypass the login in Minecraft and play in servers using the demo version

I am a 15 year old Minecraft Player and a coder and I like to break games and find glitches and while I was trying to find a glitch I found that we can play Servers from the Minecraft demo version but I didn't tell this to anyone as I don't like that we pirate a game that developers have invested whole life in. 

This is how I found this glitch

1. I installed Fabric version of Minecraft
2. I install mods that were InGameAccountSwitcher (used to change account ingame while being in the game menu) and MultiplayerButton (used to access the multiplayer menu while being in a singleplayer world or a server)
3. Once I have created a demo world I press escape(ESC Key) and click on the multiplayer button.
4. In the multiplayer screen I can login using cracked account using InGameAccountSwitcher.
5. Add a server
6. Press play