The difference is that, in socialism, hoarding resources is illegal and prosecutable, whereas in capitalism it’s legal and encourage. Corruption is only defined when it touches the public institutions. Every behaviour that you’d consider corrupt in the public sector, is obvious common practice and even encouraged in the private one.

In the public sector, hiring an acquaintance or family member based on trust is illegal and punishable. In the private sector I’ll hire whoever I want for my company.

In the public sector, having a service done for your company such as a renovation of the office, if you hire based off friendship or trust, you are punished, you’re supposed to be efficient and impartial. In the private company it’s expected that you’d hire your friend to do the renovation.

In the public sector, lowering the wages of the employees to higher your own, is so obviously corrupt that it barely ever happens at all, and when it happens it’s absolute scandal. In the private sector we just call it “labour is paid based on your replaceability”.

The list of behaviours that we’d find corrupt and morally reprehensible (and legally punishable) in the public sector, and totally fine in the private sector, is endless. Can’t complain about corruption in the private sector when there’s not such thing, amirite? At least I’d want a system in which corrupt people are prosecuted and not applauded.