Advice and answers from the Realtime Team

In operational terms nothing happens, it's business as usual. 

Your application will still be able to send messages through Realtime but you'll be billed with an overage usage of $1 per each million messages.

I'll give you an example:
Let's say you are using the $30 USD basic Ignite plan.

If in a given month you send 40 million messages your billing for that month will be: 

$30 USD + 9 million messages in overage * $1 USD = $39 USD

Did this answer your question?