tiktok-like app

I had a question about whether or not I could build a TikTok-like app using AppGyver. I tried appy pie but they didn’t allow the videos to take up the whole screen like I want it to. If I did go with AppGyver to make the mvp for proof and getting my first couple of users, can I cut ties with AppGyver and make a custom-coded app later on and migrate smoothly, or am I stuck with AppGyver? Thanks