Do you use anything else in conjunction with it? Or NextDNS alone is enough?
I ask because it seems simple enough that I can just install it really quickly on non-technical people's computers (when they ask me for help) without bothering to downloading a bunch of extensions on different browsers, updating stuff, etc, etc...
Nextdns is enough, but uBlockOrigin or uMatrix would be more effective for the web, along with DecentralEyes, CanvasBlocker, WebRTC Blocker, SmartReferrer, and other such extensions.
Also, aggressive blocking can cause some websites and apps to break. dns.adguard.com (DoT) and https://dns.adguard.com/dns-query (DoH) whilst not aggressive don't break as many websites and apps, and would remain free to use. Nextdns would cost you $1 a month if you need more than 500k queries once they're out of the beta stage.
I ask because it seems simple enough that I can just install it really quickly on non-technical people's computers (when they ask me for help) without bothering to downloading a bunch of extensions on different browsers, updating stuff, etc, etc...