Phone suddenly has a website blocker I never installed?
So recently I've been having an issue where randomly (literally can change by the hour) some websites I try to go to are blocked by a website called comodo dns. Except... I've never installed comodo on my phone, searching for it in my apps yields nothing, and i can't find it in settings. But even on mobile data, it blocks the webpage. It's blocked fextralife (listed as scams and malware) Facebook (social, promotional) and a few others for various reasons.
I know it's not just because my landlord has it on the wifi because 1) this appears even on mobile data and 2) my computer can reach these sites just fine. Comodo has only ever appeared on my phone.
So my question is: what is it, and how do I get rid of it??? I am a grown man, I shouldn't have my browsing blocked by some unrequested 3rd party!