I have used an iPhone in the past and I believe anyone can get out of their walled gardens if they want to. They just need to research and work on it though.
A lot of average users won’t do that though. You can export everything if you work on it. The only issue which is iMessage, but that’s purely a US issue really. Hardly a problem in Europe where WhatsApp dominates it here.
Just keep at it. It doesn’t have to be profitable in the beginning but if you enjoy it, you will excel in it.