I watched first video. It clearly shows cheating around 4th minute.
Provably fair doesn't match results from cells.
What Mark done is wrong, cheating users because he thinks someone cheated on him is wrong.
Mark also rigs the giveaways . go look at the winners for the last giveaways and you will see the same players always win almost instantly.
can i prove it? no - is it so far out of the odds of probability? absolutely.
it's obvious this guy will do whatever he wants and honesty is not his policy