The same game can ship at several different RTPs
Many slots are supplied to operators in multiple RTP configurations. Unless the operator says which one is running, a published figure for that title is not a figure for the game you are playing.
Game studios routinely supply a title in several mathematical configurations — a 96% build and a 94% build of the same game, with the same artwork, the same features and the same name. The operator chooses which to run.
This means a single published RTP for a slot title is often ambiguous. A figure quoted without saying which configuration it describes, and without the operator confirming which configuration is live, cannot be relied on for that operator.
Where a game genuinely has one fixed figure, it is usually because the mathematics is fixed by the rules rather than by a setting. Roulette is the clearest case: a 37-pocket wheel paying 35 to 1 returns 36/37, and no configuration switch exists to change that without changing the game.
This site records an RTP only where the figure and its configuration are both established. That is why the RTP section here is short. A long table of slot RTPs copied from other sites would be easy to produce and would not be worth anything, because most of the entries would be describing a build that may not be the one running.
If you want to know the RTP of a specific slot at a specific operator, the only reliable answer comes from that operator's own game information panel, read on the day you play it.
To see what an RTP assumption does to a wagering requirement, use the expected balance calculator. To see how widely results scatter around it, use the variance explorer.