https://www.cnet.com/news/dolby-vision-hdr10-advanced-hdr-and-hlg-hdr-formats-explained/

Dolby, Technicolor, Samsung, Philips and others have different ways to create the beautiful high dynamic rage (HDR) images that make your new TV look its best. In theory, they can all coexist inside your TV, and streaming and Blu-ray can also support multiple formats. That's why it's not the kind of winner-take-all "war" the tech world fought over Blu-ray and HD-DVD or VHS vs. Betamax.

That said, every HDR format is a bit different, and they're still competing against one another, especially for support from different companies.