The pump and dump will occur in all the coin,which include the bitcoin.
Just because price of something goes up and down it doesn't mean it is pump and dump.
Pump and dump is a market manipulation and the dump is always equal size to the pump or pretty close to it. Meaning if bitcoin were a pump and dump its price should have never gone up.
For example take a pump and dump shitcoin like ETH, its is pumped to 0.15
BTC then dumped hard down to 0.03
BTC and can never go back up again.
But bitcoin goes from $31k to $48k then has a
correction to $44k and then goes back up to $47k again getting ready to break $50k. In a pump and dump however, the price would have gone from $31k to $48k then dumped down to $31k and went lower to $25k.