If anyone wants to offer a 50% house edge, and users want to play a game where they're basically handing the casino money, I don't have a problem with it. But considering how highly unusual this is, I think they should take steps to make this extremely clear and explicit.
Showing the winning chance is good, but many people aren't fully aware of how this translates to house edge
Based on the image above, I think it's pretty clear, really. Shows chance to win, as well as profit (most sites won't show profit from the roll). To me, that's a good enough sign. I don't see any trickery there.
It is certainly clear for say around 90% of players. What about the rest? What about someone who doesn't read it? Those who have trouble with numbers?
I'd say Moneypot should restrict maximum house edges of its apps to a reasonable level, so that players who trust MP are not exploited.
On the other hand, there are apps that have customization options that lets a player play as long as the house edge is greater than a limit (so a player can play with 99% edge too). But that is a completely different case and is fine as long as the house edge is shown as in plinkopot, but hadn't been so with BB plinko.
If MasterDice is allowed, soon there will be apps that say 0.50% winning chance for 2x. It might get even smart players confused till they make a roll.