Author here. Except for a moment where they shut off invites entirely, it's stayed consistent at a linear 800/hour for the last two weeks. At some point, presumably, they'll increase that but they haven't yet. The prediction on caniusemailboxyet.com ended up being accurate to the day. In my post, I disclaimed this by saying that the figures were at the current rate.

And I'm not "whining," thank you. I already have access to the app. I just thought it was a fun way to visualize the line.