First a friendly advice to you:
- Focus on quality of your content rather than going to bot help. (Yes I do understand it is really difficult to get recognition even after writing quality posts. So find good communities which appreciates your niche.)
Secondly about Minnowbooster. It is one of the transparent bot services out there in my opinion.
It was but not now. They should check it on regular bases. I am already working on it that is why I write only 1 article in day.
1 article per day does not guarantee quality!