Selling to desperation is not the same as an MLM. TikTok grifters don't expect their watchers to then go out and grift on TikTok themselves while giving the original person a cut, there are no levels to this sort of grift, as would be required in a multi level marketing scheme.
Most TikTok products I know are not of a multi level format, the originators do not care if you buy their course then make your own course as they see none of that money beyond the initial sale.