My interpretation is that, if the server has no ICE, then the runner must encounter the ICE that Mti installs just as if it was there when they declared the run. Step 2.2 in the run timing chart says
Either the Runner jacks out: go to [Step 6] (cannot jack out if this is the first ice approached this run)
and it would be the first ICE approached.
I’m surprised how scared people sound about Mti. There’s a lot of awful ICE you can faceplant, true, but the corp won’t always have those available or be able to afford to rez. Anarchs will have heap breakers, Shapers SMC. Admittedly, Criminals are in bad shape…what else is new.
But this ID (like Aginfusion before it) actually makes ICE good! Is that really bad for the game? Anything that centers the ICE-Icebreaker interaction has tended to be heralded as “traditional Netrunner” while archetypes that move away from that (no-remote FA, asset spam, combo) generate community complaints. The designs of both these Jinteki IDs are wonderful to me and they also highlight some good ICE design in that very few things can kill a careful runner outright—look at Mlinzi, which is a brutal piece of ICE but one which gives the runner the choice to mill themselves instead of die. Komainu is similar, it needs a House of Knives combo to actually kill. These can both be terrible against Anarch in certain situations (Mlinzi tutors for retrieval run, Komainu surges up Clan Vengeance); they have natural predators in the card pool.