Doesn't matter what you use. You can't trust anyone with the privacy of your identity.
Use VPNs for what they were meant for - establishing a virtual private network between machines that are a world apart so they can communicate without eavesdroppers. Examples:
your company laptop and the rest of company infrastructure
your mobile phone on vacation and your Bitcoin node sitting in your home network
Or for watching region-locked content on Shitflix.
It's ok as a vpn provider but I wouldn't trust their no-logs policy. I wonder how they built their reputation as a private vpn since they cannot really prove it.
You don't. You are just paying a monero address with a LN transaction.
I find it especially practical when BTC network is congested and the merchant accepts other coins.