At $2/month, the exchange doesn't really do anything but pay to normalize the idea of a consumer market for selling your personal data. And as other comments on the post have pointed out, this is just the starting point. If people will consent to x for $2, consenting to y for $4 or $10 or $50 dollars is officially on the bargaining table. Deeper and deeper behavioral data will only become more desirable as the AI arms race heats up, so I'm confident we can expect surveillance demands to grow in the coming years. The outcomes for personal data markets are self-evident.
I'm not about to agitate for laws against programs like these, but I don't think they're a good thing for society and they seem quite contrary to anything privacy advocates stand in favor of.