1. All your emails if you use iCloud for your email, and thus potentially locking you out of any other sites that use email as a 2-factor-auth.
2. All your backups on iCloud.
3. All your data on iCloud.
4. Every single login you have where you used sign-in-with-Apple.
5. Every app on your phone that you have a paid subscription for.
6. The fallback login mechanism on any of your Macs where you used iCloud as the login fallback.
The list goes on. They ask you to tie your life to iCloud. They tell you to make backups on iCloud. According to the reddit thread, this can happen if there was a fraudulent charge made with a credit card associated with the account... Not even done on the account. So then all of your data disappears? Is that enough wrong here?