Gab had an app, but it got removed because censorship. They maintained it as an apk that could be side-loaded on Android for a while, but in the end, when they reworked Gab to be part of the Fediverse, they instead gave users the ability to use any Fediverse software to browse Gab. (Most of those pieces of software banned them, but I believe there are some, like Fedilab, that still work.)
The same will happen to Parler, if it is indeed a legit service.
No app = no longevity . For now Parler Has an app. Gab never stood a chance
Gab had an app, but it got removed because censorship. They maintained it as an apk that could be side-loaded on Android for a while, but in the end, when they reworked Gab to be part of the Fediverse, they instead gave users the ability to use any Fediverse software to browse Gab. (Most of those pieces of software banned them, but I believe there are some, like Fedilab, that still work.)
The same will happen to Parler, if it is indeed a legit service.
Yes I believe you will be right . Apple will ban it .