It is not "extraordinary claims require other similar extraordinary things to have happened in the past". That is not evidence for your claim.
The point is that "corporations will monetize data" isn't an extraordinary claim.
This company will monetize this data is also an ordinary claim (from history), but similarly needs evidence. "Companies have monetized similar in the past" is not evidence they'll do it in this case.
If you're a gambler, you should absolutely use that fact to inform your betting, but it's not evidence.
Example: https://support.google.com/adspolicy/answer/143465
"Advertisers can’t use personal hardship categories to target ads to users or to promote advertisers’ products or services. See below for specific examples of what we don't allow."
"Examples: Treatments for chronic health conditions like diabetes or arthritis, treatments for sexually transmitted diseases, counseling services for mental health issues like depression or anxiety, medical devices for sleep apnea like CPAP machines, over-the-counter medications for yeast infections, information about how to support your autistic child"
Like if you claimed "pine sap is sticky" I don't feel compelled to challenge you and demand to touch it myself before I believe you. I've encountered plenty of pine sap in my life, and it was all sticky. I _have_ evidence that pine sap is sticky generally, so I don't demand _extra_ evidence that a _specific_ portion of sap is sticky.
Complex things are, well, complex, and absolutely not all the same.
The extraordinary thing here is if they bought the data to /not/ monetize it. That requires the evidence. Not the overwhelmingly expected thing. They are mutually exclusive alternatives after all. Go with the overwhelmingly likely one until you've got a solid reason not to. We don't here.