They're great for marketing campaings, but there's no inherent SEO value in them.
It would be much better to have: medium.um or construction.on
Whole keywords with ridiculous domain extensions
Google has stated many times that EMD (Exact Match Domains), don't factor into their rankings. Now they're talking more about "where-to-buy-cheap-meds.com" but there's always more to their practice than the example they give.
Google also states, and we've proven several times, the domain extension doesn't matter, it's still about the marketing of the domain itself. There are some extensions that Google flat out stated they will not bother to index, but barring that, there's no restrictions.
I'd much rather have "medium.biz" and get a whole word match (it would BOLD in the search results pages), than a broken word.