If your users don't have another option, or your product has serious network effects, users will keep coming back. From Fast Company 2016:
"To test its users’ loyalty, Facebook sometimes made its Android app crash for several hours over the course of several years. ... Users were so hooked that they “never stopped coming back,” despite the errors."
"To test its users’ loyalty, Facebook sometimes made its Android app crash for several hours over the course of several years. ... Users were so hooked that they “never stopped coming back,” despite the errors."
https://fastcompany.com/3055089 (2016)