I think this is wrong. The fact that elon musk or israel was able to fund a public PAC in US transparently is a good thing rather than behind closed door, unlike how walmart did in developing countries like India and got caught.
You seem to be stuck in "either or" thinking instead of "and". In other words, the closed door meetings will happen either way. Transparency is performative.
No I am not, I am not claiming absolute transparency I have only mentioned it incentivises it, and that incentive is better than anti incentive, it's shades of gray.
They had also deals behind closed door. The public thing is on top of it and enables them to do a lot more. There are no additional poaitive incentives.
And practically, corruption got much worst after supreme court legalized more of it.