Maybe it is illegal in the sense that some succulents ARE invasive species

I do know that people go to garden shops looking for free material for growth lying on the ground, which id argue is unnecessary. Most people who own plants or a garden will happily share with you the fact if you show the ittyest bittiest piece of interest in them, and also share plants as well.

Hell I regularly give out succulent saplings for free or as a gift to friends and people I meet.

So yeah, you can just ask man, it's no biggie