None of the big VPN companies officially endorse use if their services for piracy or any illegal activities for that matter.
But to crack down on it they would have to keep logs on your activity and with that most of their legitimate use cases wouldn’t be valid anymore either.
That’s the thing. I get that people using the service on a third party client and not seeing ads is hurting their bottom line as they use bandwidth and not make money. But just banning them outright is a shit move. Ideally they would’ve made it part of Reddit Premium to make that a bit more worthwhile.