Tables was never a supported Google product. It was an Area 120 experimental prototype. By design, Area 120 prototypes either get shut down or get merged into real products.
AppMaker was Google's AppSheet competitor that was shut down after a few years.
> Table’s features and capabilities are now integrated into AppSheet, our no-code platform that blah blah blah
Seems like a usual Google product in that if you use it, you'll be forced to migrate all your data/workflows to some shiny new thing every few years.