As usual, the answer is “it depends”. Observing too many people are buying the same product at a supermarket, is not insider trading. Observing product sitting on shelves for far too long, again not insider trading. Hearing your supervisor say that they’re hearing a product will no longer be stocked after the current contract is up, definitely insider trading.

No, that’s not insider trading unless you’re trading your own company stock based on that info.

That’s no different than you as an individual deciding not to renew Netflix and shorting Netflix stock in advance of it.

No. Unless you are the sole buyer or at least >30% of the revenue comes from you. The keyword is "material" nonpublic information.