Ah don't you just love a good mystery coin?

As you'll have noticed their website (at least the one linked to coinmarketcap) is empty, but it wasn't always like that. This is what the internet archive shows us:

https://web.archive.org/web/20141005232852/http://www.jinnlabs.com:80/

Then the coin was discussed in detail here:

https://letstalkbitcoin.com/forum/post/making-sense-of-jinn

Also, note the comment at the bottom of one of David's links (https://dev.to/buntine/the-balanced-ternary-machines-of-soviet-russia):

• (...) FYI the IOTA project has a prototype ternary microprocessor (called JINN) and they are working on plans for widescale adoption in Internet-of-Things devices. Specifically it will provide low-power high-velocity nanotransactions. They have their own "cryptocurrency" token with it as well. So we may see a resurgence in ternary coming soon. (or maybe not, who knows?)

Since Iota just went sky high after announcing a big deal with (among others) Microsoft and Fujitsu (see: https://cointelegraph.com/news/iota-price-explodes-after-agreement) I am guessing the current spike in Jinn is stemming from a small group of people that are very aware of the link between these projects.

Have to say: sad I didn't figure this one out before..