A big no no is to steal domains that just lapsed on their registration by mere seconds or minutes and then engage in price gouging via a scheme that makes Park.io not legally responsible (because well it's the owner of the domain who had purchased it via Park.io who is doing it, and do we really know that it's that owner or park.io itself hiding behind a some fake user account?)
Anyway, the idea of stealing domains and then ripping off people who are interested in them is really super amoral and stinky.
People should do good in the world, not make it a worse place , and then bate others with how much they make for sake of publicity and more money.
B.S. business model.