With FindTheMasks, we found that tooling written around Sheets may also confront the 5 million cell limit.

As you tack on extra tabs and handle more fields, it isn't too hard to approach that limit.

If we do trip that threshold, we will be forced to degrade some functionality.

As a bonus, I don't believe that Sheets allows anyone to see exactly how many cells are in use, so one lives with a probabilistic risk of lockup.

If we were continuing to handle large volumes of intake, a switch to Airtable would be in the works. Fortunately, the PPE situation is at least somewhat better than it was in March, so we are simply keeping the lights on and wheels turning.