Limitations on the ChatGPT subscription should have to do with the usage limits of the tier you paid for (and I don't think anyone has a problem with that). If I'm in the limits of requests I paid for then it's usage rather than abuse.

"Abuse" checks should only come into play when someone tries to leverage the free tier. It reminds me of those cable companies that try to sell "unlimited" plans and then try to say customers who use more than x GB/month are abusing the service rather than just say what the real limits are because "unlimited" sounds better in marketing.