I think people have to get more serious about separating science as a procedure from scientism (that is, philosophical issues that are often discussed in tandem). When one uses the phrase, “science denier”, it often means, “you don’t agree with my philosophy/metaphysics/economic policy” rather than “you deny these particular facts”, which causes people to be rightly concerned. I’m not optimistic that this is going to change anytime soon, but this, I think, accounts for many of the issues in current discourse.
Dumping chemicals in shared rivers/air vs placing ads in a privately owned space that users have the option of visiting. Not comparable.
The fact that more people use Gmail than Protonmail / others is a testament to their willingness to trade their eyeballs on ads for a service they don't have to spend their monetary resources on.
It's also worth asking - what makes you so confident about an absence of malfeasance from the largest, unbreakable corporate entity (ie. the government)?