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Various companies have been doing this for a while (and it's a business model that existed long before the internet).

This is the one I know best and have used: https://clarity.fm/

It was great a few years ago for validation for a B2B product we wanted to sell and needed unbiased feedback on.

"It was great a few years ago for validation..." It isn't good anymore?

I don’t know, as I haven’t had a reason to use it.

Justin Kan & others tried this a few years ago with Whale (https://www.crunchbase.com/organization/whale-3)

It exists, it's called https://earn.com/. You pay in cryptocurrency, but it works.

I'm fairly sure that has been tried before a few times. Is it really needed though? Stack exchange is fairly good for free.