This is not true at all. https://en.wikipedia.org/wiki/Post-quantum_cryptography good place to start if you’re genuinely interested. Most password managers that are worth while will be using symmetric cryptography which just requires longer key lengths to survive in the quantum age. AES256 should be fine for the foreseeable future.

Replying to this pretentious comment for the sake of others reading this:

Run history | grep genpasswd for why this is not a good password storage solution. One must image skill issue.

If you think the CLI is the cool kid way to go, use https://www.passwordstore.org/, but tbh I don’t recommend that either.

Yes, but if you can’t get your own modem it’ll at least stop you from having your traffic slowed down by the router side of their hardware

Don’t know you exact situation, but you should be able to bring your own modem (or modem/router combo) or put their provided unit into bridge mode