Your in-laws are both right and wrong at the same time, investing on crypto is indeed a gamble but like the common gamble we have around like you rightly said, because you can't correctly predict what will happen in the next minute, but it is also a risk worth taking, because it has the tendency to make you than to marl you..
If one is looking at cryptocurrencies as a means, to get out of poverty as fast as possible, then something must be missing somewhere, it involve process that must not be skipped.
Thank you for digging into some of the culture of Finland....smile
or just HOLD and wait it out