https://www.coingecko.com/en/coins/digibyte/trading_exchanges
I really doubt this is happening to artificially inflate the number the volume of DGB.
And yes, you could do it all day if you wanted to, but if someone sees trades like this happening, and does some strategic trades while your bot is running, they could make you lose some money. It's not worth the trouble/risk.
It's way more likely that the volume of DGB has been high because the price spiked.
People would be more likely to try and pump/dump by the type of trade manipulation method you suggest than they would be to raise the trading volume for no reason.
So, if I understand you correctly...
They eliminated trading fees so they could artificially inflate their trade volume, so that more people would come and trade, so that they wouldn't make any money off of that trading because there are no trading fees.
Um, I'm not seeing the logic here...