This is the crux of this. Let’s not pretend that much of this is anything other than “open source clones of Mapbox”.
PMTiles is genuinely innovative and I’m delighted to see it getting traction.
Maplibre GL (which I use and like very much) is a fork of the last open source version of Mapbox GL, with not many code changes between now and then.
Maputnik is an open source reimplementation of Mapbox Studio. Mapbox went on to hire its original dev.
OpenMapTiles started life as basically a how-to/makefile pulling together the disparate, poorly documented parts of Mapbox’s open source tile generation code. It’s now mostly known for a reasonable, not particularly exceptional vector tile schema.
It’s great that people are now shipping production vector tiles without paying the Mapbox dollar. But, PMTiles aside, this is still Mapbox’s world. The next challenge is to evolve the tech stack to something beyond what Mapbox worked up five/ten years ago.