Jack Ma said on an interview that he don't know about Bitcoin at all, so how can he come up with the conclusion that it is a bubble if he doesn't even know how it really works, lol. It is obvious that he looks at Bitcoin as a competitor of his online payment processor called alipay,
This is exactly the main problem, the business owners are troubled by the introduction of bitcoin because it will challenge their business model and they wanted to create a fear into the minds of new users who are in two minds and some people are creating these panic situation, but people who understand the technology could understand how things will go, i am not in this market because someone said so and i do not care about anyone's opinion.