All VPN's mentioned here are free VPN. Even paid VPN's collect information let alone Free VPN. I don't think crypto users need to use VPN's. Because, no will be able to trace you with your Bitcoin address if you don't leave any clue. If you want to hide your Bitcoin uses you can use TOR. Read this quote from Satoshi.
When you send to a bitcoin address, you don't connect to the recipient. You send the transaction to the network the same way you relay transactions. There's no distinction between a transaction you originated and one you received from another node that you're relaying in a broadcast. With a very small network though, someone might still figure it out by process of elimination. It'll be better when the network is larger.
If you send by IP, the recipient sees you because you connect to their IP. You could use TOR to mask that.
You could use TOR if you don't want anyone to know you're even using Bitcoin.
Bitcoin is still very new and has not been independently analysed. If you're serious about privacy, TOR is an advisable precaution.
So, you shouldn't use a free VPN by compromising your valuable data. You should use TOR instead.