I can’t pay for my rent with it.

I linked to an app service created specifically to pay rent with crypto.

And I can’t really buy any physical property with it.

You can really buy physical property with crypto. I gave you examples.

Just because someone somewhere did do that, it doesn’t mean I can.

Yes you can. All you need is the crypto.

I don’t have any cryptocurrency so I can’t actually buy anything with it.

What?

I don’t have any Japanese Yen so I can’t actually buy anything with it. Therefore Japanese Yen is useless?!?

No

Checkmate.

OK. I’m playing chess with a pigeon.