Using Siberian Storm as an example, we provide three math models for the game with different RTPs. Any of our casino partners can choose which math model they want to offer their customers. They can't change the RTP on the fly, like while you are playing the game, but they can take the initially offered game down and then put up a different math model if they so choose.
That really is dreadful TBH.
It's been a pretty well known practice here in the UK with our AWPs for as long as time, get the new games in on a high RTP (albeit AWPs are compensated but the principle remains the same), put them at the front of the arcade, get players onto the games, and then knock the RTP down.
By the time they've sussed out what's going on, they've been cleaned out.
I realise this is not your fault Bonkerjerks, and I genuinely appreciate your candour as to how this can work - but the idea of an online casino getting a high variance slot onto their books at a good 96% payout, before dropping it down to 92% at some point in the future with the player having NO IDEA WHATSOEVER that this has happened is just awful.
For the good of your brand and your reputation as a slots provider, you really should have all online slots displaying their ACTUAL theoretical RTP. It was bad enough knowing that there was a range, now that I know the casino can start off at one RTP and then change to a lower RTP at a later date - no thanks.
(I'm not singling out IGT slots here BTW, I'm starting to feel more uneasy about MG as time rolls on, since they simply won't give a slot-by-slot breakdown of their RTPs. As a UK player, I'm gravitating more towards Jackpot Party and 3Dice, who are impressively transparent as to the RTPs, variances, and progressive functionality of their online slots on an individual basis.)