That’s not mutually exclusive to datamining though*. Yes they have a product in their stores, but the customers are unwitting products (to another customer-group) themselves (tbf this happens a lot, which does NOT make it ok however)

*not saying this happens, I don’t know if the EPIC store datamines, I have never used it as I am on linux so I may as well not exist to EPIC

A quick search tells me there is something called Screenruler in linux, does that work for your usecase?

Haven’t used it myself so I can’t give any endorsement or critiques, but it seems to be similar to the linked windows tool