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

Read also:

• The two rules investors need to follow right now as the S&P 500 eyes a return to 6,000 - MarketWatch
• ‘Tyler Perry’s Straw’ Review: Taraji P. Henson Plays a Woman Well Past the Verge of a Nervous Breakdown - Variety
• Why is the world male-dominated?
• What do you think is the most powerful line in the song "Non, Je Ne Regrette Rien" by Édith Piaf?
• How was cancer treatment different in the US and the UK?
• Here's What To Expect From A New COVID Variant Going Around - BuzzFeed
• What parts of the Bible, if any, are inappropriate to read to children? Why?
• Man accused of writing Trump assassination letters was framed, officials say - BBC
• New study shows that milk consumption improves gut biodiversity and cheese reduces certain microbes - Earth.com
• How do you handle your mother-in-law after you heard her talking badly about you in the next room?
• Social Security June payment schedule: Here’s when recipients will get their checks - LiveNOW from FOX
• What is the XXX XXX Keerna Kappor video?
• Gastroenterologist shares 5 early warning signs of poor liver health: From loss of appetite to dark patches on face - Hindustan Times
• SpaceX May Be Failing to Get Starship Working at All - futurism.com