I would never expect a company that did log to refuse to give those logs to a court. That would be corporate suicide and executives would end up in actual prisons. I also wouldn't expect a VPN provider to refuse a court ordered warrant to begin logging your particular traffic or something like that. So if a company has appeared in court and failed to produce any logs and the court has accepted that information as not existing, it's hard to get stronger verification than that. And that has occurred with at least a few VPN providers (while a few have provided logs to the courts, proving they log).