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Some of the providers that actually have ONE fix RTP version of the game(s) are:
Big Time Gaming
Relax Gaming
YGGDRASIL
Elk Studios
Iron Dog Studios
Nextgen Gaming
Kalamba Games
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Where did you get that info? It's very interesting to me. Can you share, please?
~ In the case that games are hosted on different servers (not official servers of the game provider), then those are "fake" slots, and yes, anything can happen. Here I am talking about industry software providers (Pragmatic, Microgaming, BTG, NLC....etc).
But reputable gambling sites don't do such things, right?
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To add, if I'm not mistaken, online casinos' RTP on both DEMO and ACTUAL slot can be different, in which they add more RTP on the DEMO mode. Not sure if it's absolutely true, my experience on both gambling with real money and playing demo modes, in demo, I'm winning a lot. So I guess it is somewhat true.
This is certainly not true. Regulators would shut down such site/provider immediately.
Also, form my personal experience, I can't say the payouts in DEMO mode is higher than they are in real mode.
I read somewhere (I think it was Wired, but I can't find the article now) that slot providers can change RTP of their slots for promo reasons on a grand scale. Not just 2%-3%, the difference we are talking about, but increasing the RTP to something like 150% for some time. But it's still a mystery to me whether it happens or not in reality.