While no expert, my understanding is that as an Auto entrepreneur, I currently pay tax (social contribution charges) and for the first 2 years or so of business I am exonerated from further charges. After this, I believe I will have to pay contributions towards maternity benefits, apprenticeships etc…so not sure whether registering as an Auto entrepreneur is the best option for what is an extended hobby.
If you post the same comment in the Auto entrepreneurs group, I think there are some experts there who probably know a lot more than me 