As they say "RTP is now ~ 98% on average, across all games modes" in this post from December 2019
https://www.twitlonger.com/show/n_1sr3buqI could not find any other reference about their housed edge which is a put down for me.
This statement is mostly outdated since various slots have like ~94% RTP, and I'm not so sure how they calculate RTP correctly in their "original" games like dice, crash, etc. These are games that require users' actions. Not sure if it can be simulated, or they have enough real data to say that since actual RTP will fluctuate.
It's more common to use the term "house edge."