I know is nigh impossible for companies to last forever
So I wanted to know since most Bitcoin holder are HODL
What would happen to a wallet when the company hosting the wallet closes down?
Has any wallet company ever closed down before or experienced issue that affected holders Bitcoin?
If the wallet supports open source and provides a seed phrase (BIP39). Then I think it will be fine. provided you have stored the Seed Phrase safely elsewhere. In the note that you put in the safe or whatever method you use to secure it.
But if you keep it in a custodial wallet, you will actually be in an insecure area from the start. because you have made the mistake of entrusting your assets to be stored and managed by a third party. So from the start you did not have full control over the wallet.