It would be funny if this blew up in SoftBank's face. I think it will make even Theranos sound more sensible.
Sure, the product exists and it's good but the "business plan" and its assumptions and business structure don't make much sense.
Though I don't know how long they will survive without any more cash injections in the short term due to all their rental liabilities.
In reality, it is a very good product with slim margins. The reason it is losing so much money is because it is expanding quickly to show that it is a "high growth" Unicorn company.
It isn't that it's a scam, it just puts it is a non-tech/non-SaaS category. Every founder/CEO wants to tell a huge growth story. If private investors are buying that then it's just that they miscalculated, but not defrauded.
A product with slim margins is one that you divest from so you can focus on the products with good margins.