What are the tax implications for me?

As a creator, you are responsible for filing your own income tax. 

Any Swiss withholding tax or other taxes (including but not limited to income tax) applicable to you as a creator will be entirely borne by you. Withholding tax would apply if you would be economically dependent on SPAARKD and/or have an employee-employer relationship. Withholding tax will therefore not apply to you unless the above is true.