Well, I didn't exactly change the filetypes, I simply retook the images in the png format, well screenshoted in my own time and uploaded them. As for the old jpg formats, I deleted them due to compression artifacts.
Well bots, bots are essentially user accounts that run automated, or semi-automated programs. Every bot has a controller, and every bot is run a bit differently. So there are basically 2 types of bots, 1 type is AWB bots, which are run semi-auto, and the other type is bots that run via code, most popular among "more advanced" bots are python bots, bots that run via the programming language, python.