Yes, the basic version offers all the technical requirements for operating a legally compliant WooCommerce store. The Pro version offers additional, extensive features.
Yes - with the license for one domain you can operate your store including a staging environment. Do you run several stores? Then purchase the business license.
Yes, Germanized is suitable for use in German-speaking countries. Since Germanized has been explicitly optimized for the German market, you should always consult a lawyer if in doubt.
No, the business license is aimed at customers with several stores of their own. We recommend that agencies & freelancers obtain a separate license for each customer so that the customer can continue to use the license even after a collaboration.