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The worker isn’t required, having a z/x/y tile scheme just makes caching the tiles server side super easy.

Look at the network tab on https://pmtiles.io/#url=https%3A%2F%2Fdemo-bucket.protomaps....

You don't need a database to serve mbtiles. If you're deploying PMTiles somewhere that doesn't support byte offset requests, then they don't really have much advantage over mbtiles.

That depends what you mean by needing a database. MBtiles files are SQLite database files, so you need a SQLite process running somewhere to extract the requested tiles.

An mbtiles file is just an SQLite db which can store image or vector tiles which can be very useful.

It's great for exploring tiles but it essentially doesn't support range queries/requests, which pmtiles does.