The mistake you're making is thinking that paying them would mean they stop doing this. Why would they? You're not aware of
how they're doing it now, why would money being involved change it unless there was a risk of you leaving the service?
The problem with advertising is that paying for a product just proves you have disposable cash to pay, which in turn makes you a more valuable advertising target.
Amazon, for example, aggressively monitor the types of services people are building that run on AWS, and then to launch competing products as "native" AWS services - knowing that to the rest of their customers, buying the "AWS native" thing is much more appealing then dealing with any 3rd party vendor.