Do not promote or use NextDNS, it's essentially abandoned. You will not get any support from the developer when something breaks, and it will break. I tried for a year to contact him before abandoning it. Just check the help forums.
Congratulations to them, I suppose. They've temporarily returned after stealing money from me. Their service stopped working after renewing my annual subscription and when I went to try and find support, I got silence.
If you're one of the lucky few who's never had issues with NextDNS, I'm happy for you.
I have it running on every device in my household and it works absolutely fine. I keep it on Hagezi Pro++, and that requires me to go through and whitelist some sites I use. That can be annoying, so in that case Hagezi Light or Normal should work just fine to block ads/trackers and not break things you have to go in and manually fix.
OTOH, Control D offers free DNS [3] that includes using the Hagezi blocklists and other lists, but it's just a set and forget type setup as you can't look at log files to see if it's blocking stuff you don't want or anything like that. Scroll down to "3rd Party Filters" to see their offerings.
[1] https://github.com/yokoffing/NextDNS-Config