But in all seriousness, id say yes and no. Yes, because most ranges at SnG's have little variation, therefore it's probably easier to calculate hand equity (knowing where you are at). So EV decisions eventually become elementary and second nature. Making the game profitable..
As for actually solving it,
No, For any variation of poker to be 100% solved it would require a maticulous calculus that most human brains simply cannot handle. There are simply to many variables to handle in 30 seconds. We just have to do our best to handle as many variables as we can and make the best decision.
Some way this SnG is solved. Ofc not by community but by soft like ICMizer and similar.
Perfectly solved are all eff stacks for push/fold (no surprise I guess), almost perfectly are solved spots where you can play limp/raise/push pre and then fold or call AI pre.
The first stage where you still play postflop is not solved but a bit experienced player does not make big mistakes.
The main value in spins is it attracts gamblers, when you have patience and bankroll it should be good game that you can beat with some (not big) effort.
Not completely solved (there's some post-flop play), but I presume the various staking/training groups (e.g. SmartSpin) can provide near-optimal pre-flop ranges (from Pio/GTOrb) for most short stack size situations. You just have to learn them.
For all intents and purposes, yes. HU at that stack depth is basically hard solved, 3 handed is probably a bit off but still very close to optimal.
Obv that doesn't mean anyone is playing optimally all the time. It's just that if you want to see what an optimal solution would look like for any Spin spot, the tools are available.
Spins are a mixture of 3handed and heads-up play, as far as heads-up play goes, yes, heads up is heavily solved under 25bb deep simply because we're fairly shallow at 25bb and that makes the game much faster and easier to solve for "solvers", 3-handed I don't think that the % solved comes anywhere close to the % solved in heads-up games. That doesn't mean that everyone playing at 100s is playing optimally or even knows how to do that, you have to actually study those boards in order to learn them and apply the strategies taught by the solvers.
The closer the players are to playing GTO, the less potential profit there is at the tables. Stars SnGs are generally heavily weighted towards GTO, and so there is very little profit available.
Because of this, these are about the worst games you can find nowadays. If I were you I'd play anything else.
There must still be plenty of recreationals at the $100 level, because abarone recently managed to win $32,000 (inc. rakeback) in 41 days, while running about 18k below EV and without hitting a big multiplier.