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.
If the money good and risk free, it is called a heritage and it is not available for everyone.
If the money is good and available for everyone, its is called an entrepreneurship and its not risk free nor usually easy.
If the money is risk free and available for anyone, it is called a salary, but that is usually not very good.
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. Any deal, where people are attracted with false promises and where the nature of their investment is kept hidden by purpose, is a scam. Bitcoin is not what promised and that fact is being disguised now.
The true essense of bitcoin and it's system are not particularly in the terms of money, the real purpose of it is to have a much easiest, fastest and convenient ways of doing or making different transactions that can help to the people. Thus, to make bitcoin much useful and helpful to people it system can also use for investment where in people can earn a huge of money from it in just for a short period of time.