I have in my life gone to Starbucks mostly to use the free wifi.
This was especially true before I went to Korea in 2007. Starbucks rolled out their free wifi quite early relative to other businesses, so I remember using the free wifi at Starbucks while on various trips in the mid 2000’s.
Apparently, using the free wifi at Starbucks is still a thing in 2019. And apparently the FBI does it, too.
This article (link) on the emptywheel blog describes how the FBI used the Starbucks free wifi to download leaked documents about CIA hacking. Interagency cyberwarfare conducted over the airwaves while enjoying a nice nonfat soy latte.