I've developed a few browser extensions, and every week I receive numerous emails with "revenue offer". Some experienced developers know that offers like these will inject malware into the browsers of your users, but scammers who make these offers will not tell you about it. They offer "integrations" that don't look so suspicious. Imagine how many developers have accepted these offers. Then look at the number of extensions in your browser and think about how much risk there is that you have an extension with malware.
Currently you don’t.
The real underlying issue for this all is that the “Hot” sorting algorithm Lemmy (and Kbin) uses is terrible - if someone posts the same thing in 5 different big & popular (i.e “hot”) communities at the same time, there’s a good chance you’ll see all those five posts all next to each other on your feed even one has 100 votes and the others have 20.