This [0] Axios article has a summary. It also includes a screenshot of the actual email Roku sent. Imgur copy of the screenshot at [1].

0: https://www.axios.com/roku-google-youtube-tv-dispute-525316c...

1: https://i.imgur.com/4VtDUxI.png

Here's an earlier thread:

https://news.ycombinator.com/item?id=26992358

https://www.axios.com/roku-google-youtube-tv-dispute-525316c... seems to have a copy of their version of events, at least that they communicated to customers.