As far as I know, I don't have rights to found a company while working under Blue Card permit in Germany.
I've been working full-time with my Blue Card permit close to two years, and I don't have plans to change it at the moment.
Although for making my small side-projects official I want to found a business in parallel.
Seems like E-residency in Estonia (through LeapIN or manually) looks like the easiest way to do this in EU.
The problem is I don't know if this would create any impact on my permit anyhow?