Mediafire hosts my files from 2013 to this day and they're not getting downloaded by anyone, so i'd say its pretty reliable.
It may be reliable but people have gotten malware/adware offered to them before. Not the safest site to host your stuff on when you share a link. UBlock may be free to use but note that not everyone uses it.
Mostly because people cannot tell a fake download link from the actual real one
Yea, nothing you can really do about that other than avoid using mediafire links.
Or, learn2internet? I have never once been tricked by a mediafire linkI cannot say the same for my computer illiterate grandma