I don’t think it happens because I have used NextDNS and the logs show my activity.

Not as far as I know. I have never been throttled or anything ever. I have never seen any charges.

You seem knowledgeable. I have a question about this. I have ran this type of setup before. Every time, I ended up ditching unbound because it throws DNSSEC error. I have tried troubleshooting but it doesn’t work.

It is good but it doesn’t have an iOS app.

It looks good but it is not available for Linux/Windows or as a web app.

I have accidentally opened it so many times. I have to look how to close it every time