On a related note - I've had the opposite experience but it wasn't with telecom related services - it was cloud services. A friend of mine started a business that focuses on the highly anticipated luxury clothing and sneaker releases. He basically does a proxy business that routes traffic through his network so that people can use multiple IPs that aren't banned on those retailers websites so that they can purchase multiple units of these products which are usually restricted to one per customer.

We had a lot of trouble finding a reliable cloud services provider. Even though none of this is illegal at all, a bunch of them have clauses against it in the service agreement. So we avoided those. We figured the ones that didn't have it shouldn't have any problems because nothing was illegal and it's not like we are abusing the cloud services - we're talking about a significant amount of time with nothing on the network (that we pay them for) and then a short burst of traffic that is still low on bandwidth while all the clients are trying to hit the sites up at the same time. But one after another kept cancelling our accounts, citing a violation of the terms of service. We pressed a number of them for an explanation. Many just ignored us. A few outright lied and said they received complaints from ISPs about our IPs sending spam emails. I challenged them on that because nothing of what we did or any of our client did was sending emails. And we tightly controlled the network traffic, ports, etc. So it's simply not possible, they were lying to get rid of us because their terms didn't account for it. To this day, I still can't figure out why all these providers were so against what we were doing. Eventually my friend explained his use case to the CEO of one of the companies and they signed and agreement and were totally fine with everything so I'm really perplexed.