Just remember to read the "Terms and Privacy" before using it.
wefwef.app proxies information and you need to rely on their promise to not log, sell or inspect it.
They also collect "aggregated anonymized analytics".
As an alternative, you can install any Lemmy website as PWA app. Also, the native phone app Jerboa doesn't have those issues. You might want to consider one of those alternatives instead.
I too was shocked by how much it feels like Apollo and how silky smooth it is. I no longer even care whether or not someone makes a native iOS app for Lemmy.