It's not just restaurants and it's not just greedy landlords though.
We have a little pie shop/bakery in our village. I'm their accountant so I know their "books" inside out. It's been there decades, though has had several changes of owners over the time I've lived in the village.
It's impossible for them to make more than minimum wage for the hours they work. Their staff get paid more than the two owners.
Their landlord (local couple) are actually very fair and havn't increased the rent for many years - it's well below "market rate" and cheaper than comparable sized retail units in the village.
Heat, light and power is absolutely enormous cost - over £1k per month for the ovens, counters, fridges, freezers, coffee machine, lighting and heating the unit. That's for basically a tiny two roomed "shopfront" (only open six hours per day) the backroom being the food prep area, the front room being the "shop" with just a couple of counters and shop floor space for a maximum of 4/5 customers. It's tiny! Power for businesses isn't regulated, there's no cap, and despite them going out to the market for comparison quotes every time their fixed contract ends, none of the providers offer any real low price options - "unit" prices of gas/electric used are many times the same unit prices of a domestic dwelling literally next door! Utility firms are just ripping off small businesses to subsidise the reduced/capped/competitive prices they have to offer domestic customers!
Staff wages NMW increase, employers NIC increases, employer workplace pension costs, have all risen far higher than they can increase their prices so tighten and reduce their margins.
But all other costs are rising faster for businesses than domestic inflation too - bank charges, business insurance, telephone, broadband, fire and burglar alarm systems, subscriptions, etc are all rising year on year faster than inflation. Again, they can't increase prices by that much, so another hit on the margins!
It's a busy shop, the current owners have revamped what they sell, much broader range of cold and hot meals alongside the traditional "bakery" items they still sell. Turnover is far higher than it was when they bought it about 7 years ago (even adjusted for inflation, they sell a lot more and are a lot busier), but they still can't come out themselves with minimum wage profit for the hours they work because their costs/overheads have risen far faster than they can increase their prices and/or increase the amount of goods they sell.
The cost of living "crisis" may be bad for workers, but it's a hell of a lot worse for lots of small businesses as they're being squeezed even more from all sides.
I'm literally waiting for the phone call from our village bakery to say they've had enough and are getting jobs in Tesco instead and closing it down.