You can entirely be for-profit and earn your profit without the reselling of personal data. It was more common before net 2.0, for example Google first served you one or two links of ads based on your search. No saving and forwarding user data, just simply “for X amount, your webpage will be displayed to users searching Y keyword”

no problems with being for-profit, the problem is getting money from selling the private date of those using your product

“Your private data is extremely important to us, as we make money from it”, how the hell do they manage to be this shady x(((