I've been using this with ChatGPT, and a few other websites where I didn't want to install an official app. It makes the mobile site look / behave like an app, although there are some small annoyances like when you want to copy text.
I've been using this as well. My only issue is that the shortcut is only available on the homescreen (ie the icon isn't registered like an actual app), so I'm unable to launch it using other launcher apps like say Edge Gestures or App Swap Drawer etc. Having to go to my homescreen every time to launch webapps is annoying.