Try ServerlessWP on Vercel without setting up a database.
The sandboxes use ServerlessWP’s SQLite + S3 database alternative functionality with an auto generated and configured S3 bucket.
The SQLite file used by the sandbox is temporary and may be deleted after a few days/hours depending on load.
All you’ll need is a GitHub account (free) and Vercel account (free). Then click the button below to go through the Vercel project creation flow.