For ad views, the concern is specifically that people pay for clicks and views. That that can be so heavily influenced by bot traffic greatly undermines their value.

Same general idea goes for any of the algorithmic driven platforms. The algorithms are ostensibly intended to surface organically discovered things by watching how people interact with things. That they are so susceptible to distortion through bot farms should be a lot more acknowledged than it is. People trust them far more than they should.

There is also a general cost of running things concern. It isn't like it is completely free to execute on bot traffic.