You just moved the goalposts. (In this case, moved them such that your "argument" is just restating the substance of the complaint.) Wikimedia is bringing in a lot more money doing this sort of thing. That's well understood—by all, i.e., those on both sides of the issue.
Your job is not to defend the position that the aggressive ads bring in more donations, but that if they weren't using them then "they wouldn't make _any_ money". Please leave dishonest sleights of hand at the door.
A couple of years ago a Wikimedia Foundation fundraising report explained why that "Don't scroll away" phrase was added:
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“Don’t Scroll Away”
A simple, yet effective phrase that we were surprised to see resonate with readers worldwide was simply asking readers not to “scroll away” from or “scroll past” the fundraising message in the banner. We believe that addressing the context in which people donate helps improve the donation rate.
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Quoted from this report: https://meta.wikimedia.org/wiki/Fundraising/2019-20_Report
Feel free to provide an actual argument against any one of the following:
- Wikipedia is not short on cash
- The current ads are misleading and intrusive
- The ads of years past were successful despite not being this misleading or intrusive
- The point you're trying to raise, when you're not being mercurial about it (the point about "support of the hacker community" for causes "on the edge of pauper") is, even if we assume it to be true, has no place in this discussion, in light of the circumstances (i.e. what's true about the subject we're discussing—and what isn't true, either)