In the present moment pump and dump is a buzz word in the block chain cryptocurrency market. Because main reasons are the unpredictable volume of BTC and XRP. A few months back BTC started has pumped and XRP has started falling down. If there was a pump and dump group then it would be better for crypto lover.
When I see pump and dump firsr what comes to my mind is some low volume token not btc eth or some other. Bigger cryptocurrencies depend from a lot of factors. Most of them are about daily news, new president, new regulation, pandemic etc. Its not just simple pump and dump theory.
The occurrence of Pump has its own reasons, as well as dump, the reason is in fundamental factors and TA,
do you know about the reason DUMP is happening in altcoins nowadays? because the price of Bitcoin also experienced a DUMP then the altcoins followed,
but fundamental factors reinforced support and made the bounce in the altcoin price very strong dan fast recovery.