And if they were setting out to be a union in the conventional sense, that would be fine. But as a weird undefined vaguely amorphous "We're a union that's going to do political things", it matters whether the Silicon Valley liberals are going to be making all the decisions.
I said this on another thing that got lost on /new recently, but either form a PAC or form a union, but don't try to do both.
I very much expect this to be structurally non-viable. Once the union has to make positive decisions about what to push for even the apparent political unity in Silicon Valley will be revealed to be less strong than it seems when you're merely looking at the fact that "I don't know anyone who voted for Trump", let alone what happens if you try to extend it out of Silicon Valley. (And if this is supposed to be unionesque, you'll have to almost immediately as plenty of SV companies have major non-SV offices.) There are unions that were politically active, but they always combined it with a very strong message to their members that their primary task was watching out for their members. Starting right out of the gate with "Our first priority is political activism" means that you can pretty much guarantee the leadership will end up detached from the membership in a small number of years. Something may emerge from that process, but it won't be a group of people that has anything like a quorum of the "tech community"... it'll just be a PAC.