Basically it's built up by supply and demand, of course. Because the price is all built by the amount of money that goes in or out in bitcoin investment. I really think that the whole price increase is just a manipulation of someone or a group of people. The bitcoin ETF thing is being all talked about in forums like reddit and if the price wasn't moving at all, it would seem that bitcoin is not making a sound at all. We can never confirm that the price increase is due to demand/supply because we will never ever have the statistics of how many bitcoin users are there and if the new ones bought bitcoins.