Sounds reasonable for you to offer that opinion Earnoud but, I was hoping to hear from folks with less of a bias on the subject.
In addition to whether PineGrow is a “safe” software tool to use on ones system, the premise could be extended to related areas (since it’s not an open source tool nor is it a product offered not for profit). An additional area that one can be found introduced on the web is how code can be inserted into WordPress themes that a user/purchaser of the theme is not aware and that siphons information from the site’s activities back to a third party.
I’m not implying that the tool would/could do that when generating themes, etc, but it seems like a reasonable question to ask the greater WordPress community. If a healthy number of recognized high-level developers can vouch for the integrity of the product, that could be a good thing for everyone. Correct?