You really can't get around these.

1. You have to share data with service providers, that work for you. That's totally normal and fine as long as your data is not used by them for their own personal gain.
2. You also have to share your data when you are required to by law. You can't tell no to the authorities.
3. You have to be prepared for future changes in your company. You have to be able to use the already collected data in case you are founding a new subsidiary or changing the legal status of your company.

Besides. What data do they even collect? It's not like Facebook, where a lot of private data are stored. Full Name and Postal Address aren't even needed as far as i can see. Maybe not even the Country. So it's really just your your Email Address.