I'm not defending the practice, but informing users they've reached a data cap is really not the same thing as injecting ads!

Alright what about telling you about other plans they offer. I'd consider that an ad: https://lukerodgers.ca/2023/12/09/optimum-isp-is-mitming-its...

In my country's ISP, they outright force you to see an ad for 5s before you can open a webpage sometimes.