Ok, we get 2 situations:
but it's possible to make millions playing poker and it's possible to lose a million playing poker
but it's possible to make millions playing poker to lose it all later.
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if you manage your bankroll good you will not lose in poker
of course there are downswings
you can't take the results of one day as a measurement
you should take your results weekly , monthly and yearly
if you are losing then your game need to be improved