This is throwing the baby with the bathtub, completely ridiculous. They could remove internet permission from all applications except Google's own Chrome, with that reasoning. Instead of removing clipboard permissions from all applications, make it a clear option so that the user can give it when needed or only to a specific application, for instance the essential clipboard manager -- that Android incomprehensibly do…
I'd bet that less than 0.1% of users use a custom clipboard. Android's primary focus should be to make the OS secure for the nontechnical majority. These are people who don't understand permissions, and will click on app installer popups. IMHO this is a welcome move. An alternative would have been to deny all network access to clipboard apps - thereby ensuring that they are not able to steal any data.
Yet they pick on an essential feature for anyone using copy and paste hundreds of times a day.
There is much more danger in rogue browsers, by far, than in a clipboard manager.
The solution is absolutely obvious. It isn't what they decided. It is just the first beta, but we'll see.
It'd be ridiculous to need to have a text file always open in another application with constantly used bits of text, code, or info, and switch back and forth as needed multiplying a simple workflow by who knows how much in operations and time.