I don't think the word "corruption" can be used in this kind of ecosystem, why did I say so? because we all know cryptocurrency such as bitcoin works in a decentralized structure so no one is in control when you look at it in the bigger picture but if you look close to specific services then corruption might be use as a term but I bet to disagree I rather say its a tactical move to gain profit within a specific service offered to earn bitcoin and if you look at it is in a proper way because it is not compulsory taken out to anybody who holds bitcoin, it is more like a voluntarily move.