Yep, my network was set up before the ISPs here merged by a smaller one that did things simpler, so I dont even have an ISP modem, just my OpenWRT router and no CGNAT, and I've only had my IP change once so far (since I started caring about it at least). Everything newer around uses ISP modems and are behind CGNAT, on my mates modem, they wouldn't even let him set up his Wi-Fi, he had to go with double NAT-ing and setting 2 APs next to each other (the ISP modem/router has some default trash Wi-Fi). I'm praying they never bother coming to me 🙏