Netflix streaming isn’t limited.

Yes it is. It’s a monthly subscription. You pay every month. That’s a time limitation. If you pay for a month, you only get a month of usage, just like a Usenet monthly subscription.

Costco isn’t limited to 5 visitors a month.

But again, you only get the month you paid for. It’s a time limitation, just like a monthly usenet subscription.

Many ISPs don’t limit you to a preset amount of data (fuck you Crapcast).

Neither do monthly usenet subscriptions. I think you need to go re-read my original comment, because you seem to think that the monthly subs are limited. They’re not. The only limitation on monthly subs is time. Which is the exact same limitation as the other subscriptions you mentioned.