Many of the people discussing regulating the fossil fuels industry are people outside of it: when you aren't directly benefiting from a system, it is easier to see what its externalities are.
> I know many who benefit (socially and/or financially) from tiktok, instagram, etc.
Again, this fails to factor in the externalities to people off the platform (or even the harms to other people on the platform). The cost benefit analysis can't just look at the people who actively use (and benefit) from something; if you had asked only people who worked in the refrigerator/aerosol industries in the 70s whether CFCs were a bad thing, you'd get a pretty skewed answer. See also:
"It is difficult to get a man to understand something, when his salary depends upon his not understanding it." - Upton Sinclair
The rules are almost always really vague and it's not clear what you can or cannot do. For example facebook can ban you if what you've said might be interpreted by someone as offensive. From what I've remember, they specifically say that what you've actually meant does not matter. If someone just might think it's offensive, you get a 30 day ban. At least they used to have this rule at the time I left facebook, and I left it precisely for that reason.