To build gtk you are hit with GPL which sucks. To build Swift you have to pay developer fee to Apple, to build win32 you have to pay developer fee to Microsoft. Which both suck. Don’t forget mobile Android you pay to Google.

That is why everyone jumped to building in Electron because it is based on web standards that are free and are running on chromium which kind of is tied to Google but you are not tied to Google and don’t have to pay them a fee. You can also easily provide kind of the same experience on mobile skipping Android shenigans.