Why do programmers choose to write their own code instead of using code that is already available online?

Read also:

• What is the Abu Shusha massacre in Palestine?
• How do you know how physically attractive you actually are?
• Buying Guide: The Best Watches For Life During Summer 2025 - Monochrome Watches
• I’m British and I'm hella bummed about it. Wish I was American or even Canadian, ’cause let’s be real, Canada’s gonna end up part of the States anyway. What should I do?
• Since the Brits can't steer their oil tanker, what makes them think they can take on Russia?
• I broke up with my boyfriend because he wasn’t transparent about his past, it hurts me and he doesn’t care. I told him in the beginning of our relationship that it was a deal breaker for me what do I do?
• Why is there so much hate against black people?
• What is the best case of “You just picked a fight with the wrong person” that you've witnessed?
• What do you typically do while on meth?
• What was your best revenge story?