..... What's the exact risk with such automated bot?
The bot breaks down and will not execute trades that it has been instructed to do. crwth didn't mention that maybe because gunbot is reputable.
The bot breaks down how? What do you mean? Do you think it stops by itself? It has been tested continuously, and if there are bugs to report, it's relatively easy, and it will be fixed right away, and you could easily update it. If there are configuration errors, you could always reinstall it. Besides, there's an automatic backup for your configuration on your setup. I didn't think to mention it because I didn't experience it with this setup.
I took Pffrt's question as referring to trading bots in general and not specifically Gunbot. I don't think all trading bots are tested as rigorously as others so there's always that risk of bugs and other errors from the developers end. Not all trading bots have the same level of support when issues occur. The risk may be minimal but it's still there.