I often see this in the altcoin world since their market cap is pretty low or nonexistent altogether.
But what about Bitcoin?
it is called manipulation, and it depends on many factors.
one of them is the size of the market, altcoin markets even the biggest ones with the most hot air, are small compared to bitcoin market size. i am not talking about market cap, but the trade volume, the number of investors and many other things.
so it is so much harder to manipulate a bigger market.
also it depends on how many weak hands are in the market, AKA how many newbies that will sell with the first FUD and will run to buy with the first hype.
and as you can see there are quite a few of them around so it becomes possible even in bitcoin.
but again since the market is so much bigger, the effect of it will be small.