They do, however, there is literally nothing they can do about it.
It is not R.W that is setting these restrictions, its the government classification of VoiP as “wireline” and the other companies and services that are setting their own restrictions and certain requirements for their product and/or service. These issues can also affect Pre-Paid customers on the big name carriers as well.
You would need to voice your complaint to the service you are trying to sign up for, in this case, Venmo. But as many have seen, it often will just result in a scripted response.