I was going to say - obviously the author of this post hasn't looked for Minecraft mods, because there the problem is far worse.
Worse, they've got fairly effective adblock detection.
those that can't, can be usually found on this site with their official download site linked [2]
[1] https://minecraft.curseforge.com/ [2] https://bot.notenoughmods.com/
Does that launcher ask for the username and password?
That's a pretty lousy message to be teaching mostly children about password security.