If your VPN is only being used for DNS queries, then they don't have much useful data there. I've recently seen instructions for setting this up on free cloud i

If your VPN is only being used for DNS queries, then they don't have much useful data there. I've recently seen instructions for setting this up on free cloud instances from AWS/Azure/etc. If the only traffic is DNS wrapped in VPN, it should stay within the free tier (especially if you add local caching, but even that shouldn't be necessary)