Not all crypto currencies are equal.
For instance, Bitcoin doesn't have anonymity. You can trace back the origin of funds (public keys). That's how some infamous criminals have been caught in the past few years.
Transfer cost, speed, network decentralisation... are other attributes diverging from one crypto currency to another. This is basically the service that they are providing. So everyone should study them before investing, even for the short term.
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yes what you say is true, thanks for the advice. I've opened a web whose contents are bitcoin links but nothing is clear. aka do not want to pay or discharged we mining is not in transfer money