I was not referring here about the "activity" per se, I was talking about quotas and percentages of use. No matter for what kind of activity you are going to use the service, I would like to have clear from the beginning what limits of use I have.
Another thing completely different is the permissibility about certain illegal activities or loopholes in their servers. That's not my concern, that's only a question of moral/ethics/legal between the client, the provider and the authorities.
There aren't any limits. I've run my port at 100% for a full month and they've never batted an eye. The only time I've heard of anyone getting the banhammer is for repeatedly getting abuse notifications due to illegal torrenting.
Another thing completely different is the permissibility about certain illegal activities or loopholes in their servers. That's not my concern, that's only a question of moral/ethics/legal between the client, the provider and the authorities.