So much of their content goes against the TOS of the major advertisers that no one wants to work with them.
Theres literally a million sketchy ad companies out there that would be happy to buy that traffic
Who would want to serve ads on Liveleak beyond the sketchy penis enlargement people?
Safety device manufacturers (whether for OSHA type safety or crime safety) would actually have been a good industry for this.
If it is super easy then can you list what advertiser networks or affiliate networks they should use? Also it's not like somebody going to watch a Liveleak video has any commercial intent so the ad RPMs will be really low