If you have a strong network of support for housing and/or returning/new health issues, there’s nothing wrong with taking advantage of that to pursue your passion while you’re young. That being said: In other industries, this is known as “being paid in exposure”. It rarely translates into real monetary value, and it’s usually a sign that your client/startup would like you to work for free. Your time is worth more than you think. So by all means go for it if it seems exciting, but if any any point it doesn’t pass the vibe check, walk out sooner rather than later. You can get exposure to robotics elsewhere.