Back when I worked at a competitor that got pushed aside by Spotify, the internal narrative was that the labels would always give a good deal to a young company, then turn the screws on them while giving good deals to a younger competitor, so that they could keep everyone small and preserve the idea that there was an alternative to piracy without risking any real changes to their business.
It's since evolved into something else, but it's not surprising that Tidal can get some unique deals due to its close industry ties.