It is not unlawful to offer incentives to the company itself in order for them to make a deal. In fact, that's effectively how most deals close (the incentive is usually simply monetary and takes the form of a discount). The problem here is that Kail abused his position as an agent of Netflix to profit at their expense.
Vacations are typically forbidden and would immediately be seen as a bribe. This has led to all kinds of things that are practically vacations but officially are business (such as: conferences in sunny resorts, conferences that take three weeks and so on). Other 'entertainment' can come in many different forms and if not disclosed can get both parties in hot water.
On the whole, pay your own way, do not accept anything that might be construed as a bribe afterwards (so no discount on that shiny item from the company you are deciding to do business with, or not), no gifts over a very low dollar value and in case of doubt clear with legal/linemanager/accountant, transparency is key here, just a failure to disclose can turn an otherwise innocent thing into a potential bribe.
It's really not all that hard to keep your nose clean.
They still can profit massively from that, though, so it's still kind of messy territory.
A grey area would be more like whether you should offer to leave the meeting while they discuss the proposal.
Of course, the conflict definitely needs to be disclosed!
Per the peer comment, if you don't disclose the conflict, and let the BoD decide what to do in light of that conflict, then you're into the realm of looking like you're hiding something.
Are there even laws for this, or is it more about company policies set by the BoD?
In addition to generic criminal laws against fraud and bribery there’s also honest services fraud (which I’ve mentioned elsewhere in this thread) which boils down to depriving someone to whom you owe a duty of the right to your honest services.
Is there additional/secondary fraud against the vendors as well, or is the fraud strictly against the employer in this situation?
(Edit: Board of Director approval is totally hypothetical, I understand that no BoD would ever actually condone such a thing.)
(Edit: Thanks for the clarification, everyone!)