I've actually been following the flat earth "discussions" for a couple years now. Obviously, I don't ascribe to the FE views, and I certainly don't watch their videos directly. I don't want to give them the views that would generate some revenue.
And that, I think, may be why the FE movement is gathering such steam - the bigger names (Jeranism, Nathan Oakley, D. Marble, Mark Sargent, etc) are quite possibly making a living from this. Basically, modern day sideshow hucksters, bilking the naive and credulous of some money - monetizing their YT channel, setting up Patreon accounts, and so on. I strongly suspect that many of these people don't really believe the earth is flat. The big problem is the people that don't know better, those who are gullible enough to believe whatever someone says that validates their own views - or "explains" in a simplified way (albeit completely wrong) stuff that is too difficult to follow due to math, not being able to visualize in three dimensions, or not having any concept of just how big the planet is.
Edit: Aside from CoolHardLogic, other good channels to watch, if you're interested, are: GreaterSapien, SciManDan, Wolfie6020, VoysovReason, Conspiracy Catz, and others. Wolfie is an Aussie commercial pilot, and uses a lot of his flying knowledge to try to teach people why the flat earth is wrong. Which is interesting, in a way, since there are many flat earthers who don't think Australia even exists. Since the most commonly used flat earth "map" goes all whacko south of the equator, it's easier for FE'ers to deny Oz's existence than it is to reconcile that real-world travel distances and times can't possibly work on their map.
I've heard them say that gravity doesn't exist (it's all density and bouyancy, or that the flat earth is accelerating upwards at 32 feet per second squared), water is not made of two atoms of hydrogen and one of oxygen, that the space shuttle was just a big helium balloon, and that chemtrails are for hiding the firmament (the "dome"). And it just gets more ridiculous from there.
English is the result of Norman men at arms trying to get dates with Saxon barmaids and is as legitimate as any other outcome of that activity. ~ H. Beam Piper.