Brave (the browser) uses blockchain in their privacy protecting ad technology.
Skynet uses a blockchain to allow users to share their extra computer storage space for a CDN.
And I'm sure there are a few others. It's just that the amount of use cases send legitimate applications using them are... limited. Most of the ones I'd consider valid uses have a substance-full technical goal, like the two I mentioned above.
Brave (the browser) uses blockchain in their privacy protecting ad technology.
Skynet uses a blockchain to allow users to share their extra computer storage space for a CDN.
And I'm sure there are a few others. It's just that the amount of use cases send legitimate applications using them are... limited. Most of the ones I'd consider valid uses have a substance-full technical goal, like the two I mentioned above.