The person who books the car and fulfils the booking requirement has to be the main driver of the car. The main car driver is allowed to lend the car punctually to other drivers that also meet all the requirements - so there is no problem for you to lend the car to your friends & family (who are domiciled in Switzerland)!
If a third party driver is not domiciled in Switzerland and/or does not have a valid Swiss driving licence, the insurance cover may vary.
Additionally, someone who has a student driving license in Switzerland is allowed to drive under the general swiss road regulation (e.g. under the supervision of someone who is more than 23 years old and has had a valid driving license for more than 3 years)
Note that if you are older than 25 years old and someone who is younger than 25years old drives and damages your car, the insurance coverage might vary (higher deductibles). If you have questions about this, reach out to our team!