Ask HN: Are all Bitcoins of equal value?

I put in a fair amount of research without finding an answer, though bitcoin.org says price is determined by supply/demand, I am wondering can supply/demand be hacked increasing/decreasing the value of only certain bitcoin. For example,

1. Hack demand: What if a certain Bitcoin (or fraction thereof) were owned by a celebrity, I would think there would be greater demand for that specific bitcoin maybe even greater demand for the transaction should it be purchased direct from the celebrity versus additional degrees of separation from the original transaction.

2. Hack Supply: Lets say I create a new startup, and instead of paper shares/stock I purchase 1 Bitcoin to be representative of the ownership of the company. While that Bitcoin and its units would maintain its market value they would additionally contain the respective value of the company.

3. There are also things that are currently being done that in my opinion decrease the value of certain bitcoins. For example, buying bitcoin from an exchange that is not properly licensed/registered opens the door to the potential liability that a government may freeze accounts or confiscate any and all bitcoins that flowed through that exchange. Or for example, the 144,000 bitcoins that the FBI seized from Ulbricht, what if he sold those bitcoins to various buyers well below the market rate and next thing you know the FBI confiscates those bitcoins from the buyers and now the buyers are out their USD and bitcoin. Are these bitcoins inherently tainted?