They aren't though.It was a good tactic during the primaries but after seeing that the majority of democrats rejected their goals, all they are doing now is ensuring the democrats get punished which will only result in Palestinians (and Muslims in general) being punished under Trump.
Uncommitted isn't angling to "punish Democrats".
They aren't endorsing, because you can't make the ask and then do nothing in response to not getting the ask addressed.
But they are encouraging anti-Trump votes and stopping him and educating people what that means in the US system.
They are also looking at their long-term options to influence policy and who they want in power in order to do that.