The reason it's different is that domains are so cheap and the price increases are so small. Why would a major company (or even a tiny company) change their domain over an increase of a dollar or two per year? It doesn't make sense.

If those restaurants' landlords had hiked their rent by a few dollars per year, they wouldn't have moved either. But it's not uncommon to see increases of thousands of dollars per month, even for a small restaurant, when the lease comes up for renewal.