I think it would be doable but you probably wouldn't have users like others had back in the day. I remember that you could find faucets on every corner on the web, but now I almost even forgot that was a thing until I saw this thread.

You would have to roughly calculate is it even worth building, will it be profitable for your time spent? From making a website to hosting and then advertising it, you are going to spend money and time. You would also have to make a deal with those advertising companies to supply you with offers for participants. Also, you would need to make it so someone could actually earn something, which is a rarity so your website would probably gain traffic but you would profit less.

I think you should find something else to invest in, since you were thinking about this, you could find something similar but more profitable and worth your time.