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This is pure speculation on my part. I believe that, currently, if you iOS app uses any Swift code, you have to include the Switch libraries in your app. This

by trvr 10y ago

This is pure speculation on my part. I believe that, currently, if you iOS app uses any Swift code, you have to include the Switch libraries in your app. This has something to do with how quickly Swift has been changing, and Apple wanting you to reference your own library instead of the system one for now. This has caused a number of apps to balloon in size lately, but the hope is that it is temporary.

AndrewStephens 10y ago
The Twitter app uses swift and does include some 20 libSwitch* frameworks that account for a grand total of 20Mb - most of them are pretty small. It is unfortunate that apps can't dynamically link to standard swift libraries in the OS, but that still doesn't explain the other 150Mb of binaries.