To judge if bitcoin is worth to invest in, you may consider this universal monetary rule:

There is NO good, easy, risk free money, that is available for everyone.
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If anyone claims, that money is good, easy, risk free and anyone can get their share of it, it is essentially a scam. Doesnt matter if You are being scammed with money, electricity or just waste of time. It also doesnt matter if there are several people who get scammed big time at once or millions, that are scammed bit by bit, it is still a scam.
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