However, ads are also the reason why many services on the Internet are free. So maybe they are not completely bad.
And would you be willing to pay $200 one time or $10/month(say assume the average subscription time for users is 2 years), so to recoup the amount they need to increase the cost a lot.
Although Stack Overflow, terrible as it is, is not one of those.
At least it was originally like that. Nowadays political propaganda is also massive. The monetary value to Russia or Israel, of the majority of the USA supporting their side of their war, is immense.