The only time I've personally been involved with this was back in 2014 (?) with a small coin called Heavycoin. Lots of hype, decent ICO support, a short but great early run on exchanges, then the devs just...ran. Took the money and disappeared.

Bitcointalk forums were looking left and right for someone to pick up the slack and for a while they tried; running new nodes and the like, but the coin just fell apart and died.

Doesn't make a whole lot of sense to see continued trading activity on a dead coin; even minimal communication devs make me gunshy these days. With so many promising (at least in theory) coins out there these days, I'd be surprised the market would even tolerate a dev-less coin...personally, I'd assume a PnD from someone looking to get one last gasp out of the coin, but I'm not familiar with $TRI in particular.