An economic crisis will come at some point. That's because crises come and go. Knowing when a crisis will come is another matter. Since the financial crisis of 2008, central banks have implemented very loose monetary policies. Interest rates have been kept negligible and the European Central Bank has been forced to buy government debt directly. Despite consumer price inflation being very low in most of the developed world, asset price inflation is a fact. In some countries like Canada or Denmark the cost of housing is very high forcing first-time home buyers to take on very high levels of debt. The stock market is clearly in a bubble. Current cryptocurrency valuations are another bubble.
Many people, particularly young people invest in cryptocurrencies because they feel disenfranchised and betrayed by the old system. House prices are so high in many countries that young people can't buy homes particularly with the job market insecurities. Some of that discontent is channeled toward anti-establishment voting behavior such as voting for Trump or Bernie Sanders in the case of young Americans in particular. The booming cryptocurrency valuations are allowing many young people to get their piece of the asset price inflation action, particularly as institutional investors have become interested in cryptocurrencies.