Do owners of betting companies place bet on their own platform or is there a policy specific policy that restricts them from betting. Do you think that there would be conflict of interest or that it will be unethical if owners bet on their own platforms. These are the questions that I am seeking an answer to.
Why will they actually gamble? For winning from gambling? then how it's possible, that if they lose their House will win, if they win, their house will lose?

So from this point of view there is no reason to gamble in own platform. But For testing, fixing bugs, etc they can play and I assume it's normal.