- Retail and futures traders create instability by placing leveraged trades and stop orders that amplify swings.
- Market makers are aware of instability and design their bots to turn off so that they don't end up on the wrong side of a liquidity cascade.
- People with large orders often cancel them in order to improve their orders when chasing the price. (This happens in non crypto markets too, but some of those markets have incentives and regulation to force market makers to provide stabilizing liquidity.)
The most explicit manipulation is the news outlets designed to amplify positive news. But even that can be explained by desire for clicks as much as short term market shifts.