To be fair LG - who wont be reading this anyway - dont develop apps - its the streaming companies themselves who you need to contact. LG provide WebOS and libraries for which the apps are really just fairly simple GUIs - so there's not that much effort needed.
An ATV 4K box was an option to get iTunes before that came to WebOS but now it has more apps like Paramount+ - or there are cheap sticks as another option.
Apps were one of the benefits of LG in the past but over time several LG advantages are disappearing.