Thanks for the link - am I getting it right that this is a Feature Flag system akin https://www.growthbook.io/ and PostHog Flags (also OSS)? At least I got this impression from their landing page.
It looks similar, but Unleash has a lot of really awesome features that let you configure rules for when flags are enabled/disabled. Stuff like turning them on for specific domains or customer or any other metadata you can feed into it.