FYI it's practically impossible not to oversubscribe your upstream connectivity unless they either spend way too much money or offer very slow service to users. Consider ten thousand users with 1G connections - should they have 10 terabit upstream?

The more practical thing to look for is that they aim to upgrade it based on need, instead of arbitrarily throttling the users.

Where I live the cable system is fine, and the cellular system is fine... until one goes down, then the other gets flooded with traffic and stops working leaving no internet at all.