This is because Tidal gets the music from the record labels. The only version of this music now sold through retail and online outlets are the remastered copies, as they are the labels excuse for selling you the same recorded music again. It's only natural the label would want to provide Tidal with the latest remaster, as many people these days will use streaming services to determine which music they actually want to own, and are more likely to buy whatever version they played on the streaming service.
