What motivates you to contribute to open-source projects?

I've been wondering that most people start contributing from the age of 18-19 and many keep contributing for life. What's your biggest reason for

1. Making your 1st contribution
2. Keep contributing throughout your life.

Given that financial consideration is one of the least important aspect, I want to see what unique drives people have.

Also, would love to know more in this survey: https://form.typeform.com/to/Duc3EN8k
Please participate if you wish to, takes about 5 minutes.