@sproid@catodon.rocks Many domains used for advertisement are simultaneously used by JS libraries used in the website, including libraries to communicate with Cloudflare and similar; blocking one will inevitably block the other, which is likely the culprit. Based on what you said, it seems to me that Public AdGuard DNS have a less restrictive approach than Quad9, but this means there are advertisement and tracking domains making it through AdGuard. I used to have a Pi-Hole setup of sorts before my Raspberry Pi stopped working, now I'm most reliant on uBO and Ghostery on the browser (both in my laptop's Waterfox and in my smartphone's Fennec). I tried to set up a custom DNS, but Android inevitably pulls the DNS from the IPv6 LAN of my ISP's router, so I kind of gave up until I can afford buying a MicroTik or something similar to effectively isolate my LAN from their LAN, hence why I'm mostly reliant on in-browser filtering instead. But then, the phenomenon that happened regarding the website I tried to access seems to have to do with sweeping geofencing. Because I don't use VPNs (yet), my IP address is Brazilian, and Brazilian IP addresses often face geofencing due to a perceived "use by botnets" or something similar. While my ISP is regional (covering a region of small towns in countryside Brazil) and the CGNAT IP address is more likely to be used by few people (with me likely being the only person in the entire region ever accessing anglophone CAD websites), this kind of blocking often targets the entire ASN instead of individual IP addresses.