There have been cases? I see this kind of stuff all the time. I once saw an app that had a popup warning me that the TLS cert is wrong but still let me connect...
Unless I’ve looked at the app myself i wouldnt touch public wifi - even then there are other risks to consider
Edit: I would for my personal devices, unless I knew the app did something horrendous in advance- but I guess the core problem is you really have no way of knowing unless you check the app yourself or there is a known and reported vulnerability.