In any case, if this is a true story at all - people who are so frivolous that they do things like this with smartphones and not computers and don't know what a backup is, shouldn't be surprised when something like this happens to them.
In Bitcoin and cryptocurrency, non custodial wallets are recommended and by using non custodial wallets, users must know how to do backup, and how to recover wallet from backup.
Backup, backup, backup, it's important!
I've created hundreds of emails in my life, but I haven't lost a single important one to this day.
Using different emails for different things and platforms is very good practice. If one email is in a data breach, others are not and you will not lose all if one email is compromised.
[Guide] How to know if your email address was part of any data breach. https://haveibeenpwned.com/Being careful or careless will decide whether you want to learn and have better practice.