but it is really complicated you in all the time but if they are giving the free service if anyone want to use it free then it is also one of the good way to use the VPN by doing some little process after they can make it possible but I suggest you can buy something and make used for long time that is my opinion to use VPN.
You're right. I will add that there are a lot of completely free vpn. But it depends on what you prefer.
And maybe someone really doesn't have the money or rather test the service properly before buying it.