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They don't know bonus buys not be designed to guarantee profits either normal or super. But, to cut our spending in normal spin if our spin result on normal spin really flops without hitting any bonus after we doing so much spin after 100 spin (200-500 spin). That's at the time, we needed to use bonus buy (in case you want still continue to the slot game, not changing).
If they could/would manipulate this, wouldn't they do it in a way so that these streams winners would win something good? That way it would be the best promo for stake like "These people have won, and so could you!" .
Well, If you read a couple of messages here.
Even someone making some post, "Stake" only shares a post with a winner, not a loss. I mean, it's a casino, of course they are focused to share more often a winning post to lure people come to theirs site. It's most common tactic on every casino is to share winning history why would they share a lost.
Some casinos could be sharing a lost, but most the time on "Parlay - Sportbet" from a user who lost the parlay only 1 match from all match (to tell, everyone: ouch one step closer he can win such life-changing money).