It's entirely comparable and it's literally what's happening under the hood of the algorithms. There are correlations built between what you engage with and what others who engaged with that also engaged with so it would be exactly the same as asking for gang related materials and the librarian said "oh you might also want to check out books on trafficking, people who look up stuff on gangs look at that too". Are they speaking on behalf of the entire library because you engaged with them and they answered your question? It really sounds to me like you don't understand how software, servers, algorithms, etc. work.