This is the official website:
https://gunthy.org/. You can buy by sending Gunthar or me a PM.
I guess some lose and some win using a bot.
Well, there are different scenarios that could play out and end up with one losing (e.g. completely backwards settings).
Do you have any statistics for how many percent gain profit using the bot?
Read the last couple of pages. People have been posting their results and settings.
What happen if there are too many bots on an exchange?
That was a concern back in the day, however, the number of users on all the main exchanges has been growing almost exponentially and thus that shouldn't be an issue for the foreseeable future.