> A huuuuge portion of health insurance premiums just go toward spending on ads

Wrong.

"I̶n̶ 2̶0̶2̶3̶ a̶l̶o̶n̶e̶, t̶h̶e̶ f̶o̶u̶r̶ b̶i̶g̶g̶e̶s̶t̶ i̶n̶s̶u̶r̶a̶n̶c̶e̶ c̶o̶m̶p̶a̶n̶i̶e̶s̶ i̶n̶ t̶h̶e̶ U̶.S̶. p̶a̶i̶d̶ a̶ t̶o̶t̶a̶l̶ o̶f̶ $̶3̶.7̶ b̶i̶l̶l̶i̶o̶n̶ t̶o̶ g̶e̶t̶ t̶h̶e̶i̶r̶ n̶a̶m̶e̶s̶ o̶n̶ y̶o̶u̶r̶ s̶c̶r̶e̶e̶n̶s̶" [1] (EDIT: It's less than $30bn [3].) out of $1.5 trillion of premiums collected [2].

[1] https://www.bankrate.com/insurance/car/insurance-advertising...

[2] https://www.cms.gov/files/document/highlights.pdf

[3] https://www.emarketer.com/content/us-healthcare-pharma-ad-sp...