Not all VPN services require that you pay. There are, in fact, many excellent free VPNs. But all of the free VPNs we've tested have some kind of limitation. Some limit you to just a few simultaneous connections or devices on an account. Others restrict you to a few hundred MBs of data per day or per month. Others limit you to just a handful of servers. Still others do all of the above.
My rule of thumb is to use a domestic VPN and connect to servers as close to my location as possible. That said, I have had good nights and bad nights getting online. In my recent trip, I found most hotels' networks to become unusable after about 9pm. My theory is that many of the guests were watching Netflix at that time, completely clogging the hotels' pipes.
They even offer the most generous simultaneous connection count, with six simultaneous connections through their network, where everyone else offers five or fewer. NordVPN's network isn't as large as some of their competitors, so if you're trying to obfuscate your tracks, you might want a company with more servers. Otherwise, this company is clearly providing a winning offering.