I do remember a major scandal that occurred in the 1980's when somebody posted an advertisement to usenet. At the time, there was a lot of online discussion about why this was prohibited. I looked this up, and found that the internet backbone (the NSFNET) was funded by the NSF, who enforced an acceptable-use policy, prohibiting Backbone use for purposes “not in support of research and education.” [https://dl.acm.org/doi/pdf/10.1145/253671.253741]
So yes, it's possible, because we already did it once.