Google Fusion Tables will be shutdown on Dec 3rd, 2019. The full announcement is here and the key part is this:
This news is not entirely unexpected. Fusion Tables has always been described by Google as experimental and has not had a lot of growth for much of its lifetime.
We'll be working with our contacts at Google to ensure a smooth transition for those of you who publish Aggregate data on Fusion Tables. We don't yet have all the details worked out, but the likely way forward for folks who want to stay in the Google ecosystem will be to switch to Google Sheets since we have an existing connector.
If you rely on Fusion Tables, please reply to this topic and describe what you use Fusion Tables for. Your feedback will be shared with both Google and ODK developers to help ensure a smooth transition.
We'll post updates to this topic as we have updates to share.