The "current bull run" started about 2 years ago while these "mainstream" dudes started recently.
So how can an IOU trading platform that is not even linked to the real world's bitcoin market can affect bitcoin price?
This is what you want to believe, not what is happening!
You're biased from the start because you don't like PayPal you don't like their PPBTC but for the average Joe, it's a different story.
What the people who have not heard of BTC before and never bothered with the whole open account, exchange, send to the wallet, PP offers a simple way of owning something that would bring them money., they don't care about keys about fees about hacks, all they know is that if they would have bought 100$ worth of that now they have 200$. And people like that are millions, people who care about their keys about all that are thousands.
Like it or not PP has brought a lot of hype and thousands have bought coins with them, you can see tens of examples even here, in the bitcoincultist lair, do you imagine how the balances outside this, where people are not that biased?
There is a tiny difference between not liking it, as I don't do either, and denying it.
Take your PayPal example here, when an average Joe buys bitcoin from PayPal it won't affect the actual bitcoin price that is determined on bitcoin exchanges such as Coinbase, Bitstamp, Kraken or even Bitfinex. Why? Because PayPal is not linked to any of them. If all average Joes dump all their PP.BTC right now it won't affect the bitcoin price either for the same reasons. Now if the same amount were dumped on Coinbase for instance the price will be affected and will drop.
PayPal itself has bought a certain amount of bitcoin (unless they are lying) and is selling THAT to its users. So if there were any influence it had already happened when they made the purchase not every day. Whereas we are seeing the price rise every day.