> Are cheaper providers known for doing this? I would have thought they would be less lively to, as they are smaller and therefore every customer is relatively more important to them, and they are therefore more likely to check before turning services off.

In my experience, the reason they're cheaper is because they offer fewer features (cut down on ongoing expenses) and because they aggressively enforce TOS (the margins are thinner, so you're less able to afford people using more resources than allocated).