Also, the fake ones with audio or text from Trump are way too easy for anyone who has seen Trump over the years to guess (as opposed to those who know Trump from "comedy news shows" from the last few years)... because Trump wouldn't say some of those things (anti-gay marriage stuff, for example).

Biden is a bit more difficult to guess like that because he could have said anything which he thought would be popular at a given point throughout his career... but then the technology is too bad to actually be convincing enough.