Where else do you think they are coming from? Did restaurants suddenly become a money-printing business with 30% margins overnight, or something? Because for the past 50 years, running one was a great way to:
* Do a ton of work
* Make very little money
* With a constant risk of going out of business and losing everything hanging over your head.
The reality is that rents are in the stratosphere, low-end wages are growing, and so are profit margins for many (but not all) producers of goods that the economy runs on. All of these costs get passed up the supply chain to you, the customer.
It's very sad and all that a senior SWE no longer gets paid 15 times what their barista does (It's only 8 times now!), but we all have to tighten our belts and adapt to this brave new world.
Or we could eat the landlords, but that's not a hugely popular sentiment at the moment.