Here are some reasons millionaires hate bitcoin:
1. Technology: Most of the millionaires lack internet because they are not well educated in technology. Bitcoin is a digital currency which require technology to make the investment successful.
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I think millionaires hate Bitcoin because they don't have time to think and learn about bitcoin, they are busy with bigger things than investing in Bitcoin.
Regarding technology, I think millionaires have it. How can someone who becomes a millionaire not know about technology, especially the internet?