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

Read also:

• Mets and Dodgers are more than living up to heavyweight billing - New York Post
• Why does NASA's Perseverance rover keep taking pictures of this maze on Mars? - Space
• Disagreements over Duchenne therapy, management style may have led to ouster of key FDA official - STAT
• The best time to see the Milky Way is fast approaching! How to see our galaxy at its best in June. - Live Science
• Why is the United States urging restraint from Israel in its conflict with Hezbollah?
• Penguins first-round notebook: Dubas shocks; Kindel, Zonnon and Horcoff honored to join Penguins - Pittsburgh Post-Gazette
• Never Too Late to Start Eating the MIND Diet That May Prevent Dementia: New Study of 90,000 Over Decades - Good News Network
• Do Europeans typically set heating to higher temperatures in the winter compared to Canadians and Americans if the temperature at a given moment is similar?
• Have you ever been physically attacked by a demon?
• Rare Labubu sells for more than $150,000 at auction - CNN