None of Google apps use the permission Nexcloud wants. The only exception is the preloaded "Files" file explorer app which doesn't integrate with clouds.
You're attacking a strawman; anti-competitive behavior doesn't require that you do exactly the thing you prohibit others from doing. It can be anti-competitive to use your market control to restrict competition in ways that break competitors product but do not impact your own product.
In any case, you've also ignored most of my comment which WAS an example of Google going that extra step of directly blocking APIs that they leverage themselves.
You're attacking a strawman; anti-competitive behavior doesn't require that you do exactly the thing you prohibit others from doing. It can be anti-competitive to use your market control to restrict competition in ways that break competitors product but do not impact your own product.
In any case, you've also ignored most of my comment which WAS an example of Google going that extra step of directly blocking APIs that they leverage themselves.