Why do different countries have different electric outlet plugs?

There are 15 different kinds of electrical outlets around the world. One standard would be more convenient, but no one wants to change theirs.

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Types Sockets Different Countries World Illustration Stock Vector (Royalty Free) 1538272856

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Why Do Different Countries Use Different Plugs?

Power plug & outlet Type C

Plug And Socket Types Around The World - Phil and Garth

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Why different countries have different plugs?, by DesignNest Team, DesignNest

What Plugs Are Used in Different Countries?

Why electric plug points are different in different countries

A cool guide to the types of plugs and outlets across the world : r/coolguides

Why different countries have different plugs?, by DesignNest Team, DesignNest