2.5 years seems a very short amount of time to develop, launch and push adoption for low-level PL tooling (in an ecosystem that's not mature, but at least is reasonably developed). I would expect 5 years at a minimum.
I'm assuming they'll just die on the vine now?
I would assume the Swift/Tensorflow stuff will die, it was more of a thought experiment anyway…
Anyone switching after an year means they barely made it after the six months probation time, so many employers will think twice about hiring them, unless they are in pressure to hire someone.
Also, unlike UK/US, they have this nasty habbit of not mentioning their salary range/hiring budget in job ads to low ball you during negotiations.
80K is pocket change compared to what they would have to pay in their home markets for experienced devs.