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Do you contribute to open source? Why? Why...Yes, I do.
I have been contributing to the open-source community for ±10 years.
Many of my personal projects pass years unnoticed, but once in a while I receive an email from a stranger on the Internet saying “Thank you” for building a tool they found useful one way or another. Some times students, some times people without programming skills, some times IT professionals.
To answer your second question: “Why?” I make contributions to the open-source community as a way to pay back the solutions they have provided in the past. Nowadays I spend much less time building my own tools and more time searching online for open-source solutions, and fortunately I often find good ones, then I say “thank you” by reporting issues, giving feedback, implementing features, fixing bugs, etc.