For the most part I agree with you @crypto.piotr. I think something like what LEO is doing, burning the rewards earned from bat browser makes sense as it takes care of that supply and does not put the leo team in a position to decided to sell, powerup or hold liquid. It's a sure thing with the burn.
And like you mentioned in the steemworld example, that is a win-win. I like that cus it creates demand and helps cut inflation.