That process they show in the youtube video is pretty involved and very complex for no other reason than to keep people locked in to the apple store. As a layman I doubt this is compliant with the appropriate EU laws (specifically the DMA) Unfortunately this behaviour does not come as a surprise but I certainly hope the regulatory "beatings" will continue until compliance improves.
It’s no worse than the process for installing an android apk downloaded using the browser for the first time See the video for Android for comparison
On android when you download an apk and try to install it, you get a popup saying something like "Chrome needs permission to install unknown apps." with a button to cancel or go directly to the settings and give chrome the permissions, after you enable the permissions you also get the prompt to install the apk right away. This is the equivalent on windows to just clicking next half a dozen times to install some software, on ios you have to trigger the install, go manually to the settings and enable the permission, then trigger the install again.