It is just a badly ran business. The Chinese version of Groupon is ran by the very competent Xing WANG, who was a physics graduate student. And last time I looked at it Meituan was worth $15B.
Not really sure why "was a physics graduate student" means anything about his business acumen here. Eric Lefkofsky has a law degree, Brad Keywell has a JD and an MBA, we could do this all day. Having a graduate degree in a hard science could certainly suggest a person has a different way of approaching business, but Wang dropped out so he could unapologetically clone other people's ideas.
I think the OP is stating the opposite, that being a physics grad student would imply he probably couldn't run the business as well as the Groupon founders.