Bots have really been popping up heavily in so any of these markets. The DEC and LTC markets I use quite often will sometimes have 5 or 6 bots on each side so you're absolutely buried every time. I think there are several owners because some bots are immediate and some seem to check the market every minute or two to see if they are first. I don't know how they seem to work together so they don't undercut each other all the way to their programed floor in quick succession but they don't.
While I find it all annoying, especially when you have a small order and they bury you with huge orders, there are some of these bots that only work one side and push price around.
I posted on one of those about a month ago that would undercut larger orders in the middle of the field with about 2.5 million dec so the order would need to keep beating it but the order would always disappear if it got to close to becoming the best price.
https://leofinance.io/@imno/how-to-manipulate-the-dec-market-101
At the time they were pushing around millions of dollar in value with $10k and a bot that never bought or sold anything. These markets desperately need liquidity and in one sense, these bots bring liquidity, but when programmed to just undercut by .00000001, they are more of a nuisance than anything.