Here is what I heard from TripIt about google.
Indeed, the situation on Google is quite different from that of Yahoo.
Google now requires users to renew access with TripIt to continue with Inbox Sync. If access is not renewed, Inbox Sync is deactivated.
If you encounter problems reauthorizing Inbox Sync for Gmail, removing TripIt's access from your Google account may help:
1. Visit your Google Account's third-party connections page.
2. Select 'TripIt'.
3. Remove access, then try to enable Inbox Sync again.
I have been able to successfully reactivate my two google accounts. Let's see how long it sticks. I await a solution for Yahoo.
Note from TripIt re how long the google access will stick.
Google began requesting renewals every six months. However, on your Google Account page there is also an option to allow TripIt ongoing access, so you do not need to renew access every six months.
Also, I don't think TripIt is playing well with Firefox. The page shudders when I bring it up so I move over to Safari.
One hour long: my google accounts have already been deactivated.