Just because people don't read the agreements and didn't know about it doesn't mean they should have put it. Destroy physical copies is a dump clause and isn't enforcible.
Of course that doesn't stop companies from trying to enforce unenforceable clauses example: https://edition.cnn.com/2024/08/16/politics/arbitration-signing-away-rights-disney-plus-wrongful-death-lawsuit
In the case they should have made it clearer in the terms, there are many companies that try to enforce them even if they seem unenforceable like Disney in the death case.
There is no excuse to put terms like this, Disney proved that even if they look unenforceable they might try to enforce them.