Based on my own experiences I have concluded it with some features:
💚 Get more intense crawlings by search engine crawlers which will affect your site will faster get indexed.
💚 Your domain is viral in many crawler engines, your domain get more stars ⭐ as useful domain)
💚 More simplier URL and easier to remember without copy paste looooonnnnnnggggg URL ( very effective as your own made URL shortener)
💚 Didn't make your homepage get too many http requests
😓 Don't create more than 1,000 sub domain forwarding in single domain because Google thinks you use bad SEO tricks
😓 Unable to submit to sitemap if you don't have your own target page / property.
Stay tuned 🌱👍
More experimental on SEO will be posted soon....