Let's say a person is on vacation and doesn't worry about anything and doesn't read the news. And at this time, the exchange where he keeps Monero is delisting Monero. And time passes, the user visits the exchange - and what happens with his amounts on exchange that was be in Monero?
1. This belongs to altcoin discussion
2. As said, cryptocurrencies are meant for self custody, not for keeping them in others' pockets (i.e. exchanges)
3. A proper exchange will announce a delisting quite some time before it happens, then will delist i.e. will not allow deposits and trades and after quite some more time will also stop withdrawals. All this takes time, usually months, meaning more time than a non-millionaire's holiday.
So this person's problems are:
- no self custody
- being too lazy to check his assets for months
If so.. bad combination and bad luck.