I managed to install Freya on my iPhone but I somehow broke it so I deleted it then tried to reinstall it using ipa-apps.me but it then said Cannot connect to file.jb-apps.me so I tried ESign an then ESign said Cannot connect to I.yyyue.xyz

It's one of the reasons why using a custom OS like GrapheneOS and Magisk will not allow you to use banking apps or play games due to security reasons. So, make sure to have a secondary phone for that.It's your hardware so you do what you want but I strongly recommend you don't sign into any websites or apps, especially your email and bank, using an unsupported phone. You should assume that some guy in some dodgy country is watching and recording everything you're doing on said phone.
What's wrong with playing games on a custom OS? If the user isn't signed in to any services or entering their personal information they should be fine.It's one of the reasons why using a custom OS like GrapheneOS and Magisk will not allow you to use banking apps or play games due to security reasons. So, make sure to have a secondary phone for that.

They incorporate anti-piracy measures to check if a custom OS was installed and will instantly close if this was detected. Primarily Nintendo and other popular games will use these checks.What's wrong with playing games on a custom OS? If the user isn't signed in to any services or entering their personal information they should be fine.