If it increases their bottom line to sell my data, they will.

It doesn’t though, since the data (having unique targeting attributes that otter ad networks don’t have) is what makes the company valuable.

What they have that’s unique is their particular algorithm for targeting. They don’t need to keep my info to themselves to profit off said algorithm.

Targeting is mostly about having good data. The algorithms are all based on having the data. If other companies have the same data, they’d be able to use it in similar ways.