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.
true, most dumm and pumm occur due to good and bad news, this is very influential on the price of all average altcoins,
I also frequently check news on several well-known sites to find out the dumm and pumm of a coin