From what I've seen of orgs run by the current generation of activists they always spread themselves too thin trying to do everything. This has been an issue in all well funded ngos I've seen from local hacker spaces to Mozilla.
When you inevitably fail because you can't fix everything the activists leave and you're left with a ruin where there used to be a useful civic organization.
This also causes an issue of coherence for your funder/donors: If I donate to an organization that is focused on X that I support, but then later that organization starts spending 10% of it's time on Y which I don't support - then what?
It's like when I buy stock in Acme which produces widgets, I don't want them starting up or acquiring a doodad business. If I wanted to invest in a doodad business I would do that directly.
No idea if that's the case with Women Who Code though.
When you inevitably fail because you can't fix everything the activists leave and you're left with a ruin where there used to be a useful civic organization.