This is not official policy, but we view Free apps as being used for personal use, or trying Glide. If you’ve built an app that is somehow critical to your business, you should really upgrade it to a paid plan.
As Glide becomes more popular, we will be forced to reconsider limits on the free tier to control our costs, and we’ll grandfather when it’s feasible. Grandfathering often creates a lot of complexity and support burden that slows down new features.
Most limits we’ve introduced—map pins, for example—were originally free but became too expensive for us to offer at scale (I still think we are the only service with a map on a free tier). If you need a guaranteed capacity or level of service, you should upgrade.