The bank might just have well said "Investors in Stocks and Shares should 'be prepared to lose all their money'".

It applies to anything where you are buying / selling goods or services. At some point there could always be a catastrophe. And it has happened in the past for both traditional finance (e.g. 1987 Black Monday - 22% drop in one day ; Great Depression in 1929 - falling 89% over 2 years!) and also for Crypto with Bitcoin recently dropping 27.5% over two weeks from it's all time high of $64,889.

So, yes, you could technically lose all your money in many different ways!

Yet people still put their money into "safe" investing schemes with stocks and shares at their heart. ISA's, Pensions, etc... Crypto is no different - people will always invest in what they believe in.