“PowerBobs is protected by European copyright and GDPR laws and regulations.”
Like any written or oral agreement. Not only did you agree, but you were the one who offered us the freedom to use the plugin in our projects. Chronologically, at the moment our application was uploaded, the public agreement still existed.
In this interpretation, you are the one who created the situation by breaking the agreement. It is more like a scamming behaviour! Probably every lawyer and court in existence will see this.
According to this, you have no legal basis to make a claim for the very same reason why you can't take back a car you sell for the money you give to a homeless person.. Please stick to the agreement!
in short term: You cannot ask for something back that you have already given away.