Sure -it's a mix - but to be honest I think it's over-emphasized - in that in the US most of that kind of money driving politics operates in plain sight.

For example, the 'Russian interference' in the 2016 US election, was I suspect mostly people trying to make money, and more importantly, was completely dwarfed by US direct political spending.

There is also a potentially equally, if not larger problem, in the politicisation of the 'anti-disinformation' campaigns.

To be honest I'm not sure if there is much of a difference between a grifter being directly paid to promote a certain point of view, and somebody being paid indirectly ( by ads ).

In both cases neither really believes in the political point they are making they are just following the money.

These platforms are enabling both.