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1. RTP can't be verified, so you can only trust them. But, If you accused them RTP is lower than it should be informed without any proof just based on your feeling because your bet result is really wrong.
2. Tested RTP not just because of the result, and need a million of spin to see the RTP it self.
I belive for points number 2, people who understand slot especially RTP can explain this better than me. However is always based the user it self, if you don't belive on the machine program especially slot for the fairned like RTP. User always have a choice to not play this game, and play other games betting.
If you look closely in my post #ryzaadit ..you will see that I used the word "Feel" on purpose....because I know the RTP cannot be easily determined and you have to "guess" what the RTP is at any given time.
You might also notice that I am an advocate for transparency in the gambling world ...See ==>
https://bitcointalksearch.org/topic/provably-fair-rtp-5397220 ...because I feel that the guess work should be taken out of the relationship between the gambler and the
Online casino operators.
So without the information ...we can only give our opinion based on our own experience.... and from my 3 hour experience, I concluded that the lowest RTP was used during my session. (Go to the review of the specific Slot and you will see 3 different RTP options being advertised for this Slot) ...so I am not just thumb sucking my statements... I actually do some research first.