are you kidding? of course they will. back in the early days of the interwebs, it was not unheard of to have the ISP block your account when your machine got hacked from malware and used your box/connection as a SPAM server. From they, consumer ISPs just block that port. They've also added terms about not running servers on the consumer connection. While your server would have to be using a lot of bandwidth to get noticed, it is part of their terms that you agree to.

So yes, they will absolutely suspend your account until they are satisfied the usage is in alignment with their expectations.