What happens if you didn't migrate your Minecraft account?

After 6 years of playing my >100$ account Is deleted because I apparently missed the deadline : r/DeadByDaylightMobile

Don't migrate your MOJANG account!

My skin of Minecraft changes to one I don't recognize every now and then. Is someone getting in to my account or is it CurseForge responsible? : r/ Minecraft

It says I don't own Minecraft after completing migration. what happened? : r/Minecraft

I can't change my email to migrate to a microsoft account : r/Minecraft

Don't migrate your MOJANG account!

How to STILL use your un-migrated Mojang/Java account

You NEED To Migrate NOW Mojang Minecraft Accounts

Will I still receive the GTA$4,000,000 if I don't migrate? : r/GTAV

why does it ask me to buy minecraft when I already bought it about 4 years ago? before asking me this it told me cannot connect to minecraft services so I tried

Java Account Migration: A Fun Announcement by Dinnerbone

Migrated my java account to a Microsoft account then got a xbox and used the same account for it then played bedrock minecraft and now it says I need to make a new minecraft java account when I already had one and won't let me use the original java

Minecraft Java account MIGRATION tutorial info! MOVE to MICROSOFT!