The problem I've seen with paid surveys usually attract a low LSM or younger audience who have no money but time to waste or pensioners who have nothing to do, which isn't very profitable in terms of ROI, people with money don't bother filling in forms for a prize or a few bucks. The audiences you build here might be great for companies that offer loan products, gambling, and debt collection, but it gets far harder to build audiences outside those niches.

Also with Bitcoin let's say LN, for micropayments, how do you guard against click fraud, bot farms, or human bot farms raiding your survey with dups? The more PII you need to create an account the lower sign up, and the less PII you need to create an account the more spammy and the lower quality results you give the customer

Where I do see something like this working is targetting businesses, offering them a SurveyMonkey/jotform/Typeform replacement that is cheaper, better payment structure so you can buy bulk form fills or pay per use

You can still add the rewards feature for businesses to tip but I doubt many businesses would use it