Can the Banksters Crash Cryptocurrencies?

Hi

I was listening to x22 Report & his interview with Jeff Nielson - in which he explained how the banksters could manipulate the price of crypto currencies - They could buy up loads of cryptos, which would increase the price of cryptos and then sell them all at the same time - creating a crash.
Isnt there something that could protect the cryptos from this? Perhaps if cryptocurrencies werent just valued in terms of the USD but also in terms of gold?