Deplatforming people doesn't boost their message though. You don't get the Streisand effect when its 1000 trolls instead of one famous person. Also the free market of ideas just hasn't proven effective at stopping harassment and worse. There's nothing illogical about what you've said, but the real world data just doesn't support your conclusions.
I mean yeah, it's a scary time to be a queer person. Lots of our rights and protections are under attack now in ways they weren't 5 years ago. I hadn't heard that kiwi farms was back up, that's deeply disappointing.
There's a lot of consideration of if we could, and previous little of if we should. Unmoderated sites inevitably become breading grounds for harassment and worse, especially as more mainstream platforms get better at driving this content away. I would be terrified to live in a world where kiwifarms and its ilk cannot be shut down
The point isn't that its one or the other, the point is that spending on social programs is much cheaper than national security programs and makes a more meaningful difference in more peoples lives. The point is that either-or is a false dichotomy, we can have good social safety nets and still have robust national security. The reason we don't have both isn't that we can't afford both, its that much of this country views poverty as a moral failing and intentionally neglects the poor because "they deserve it".
I think its reasonable to write off development costs, given that it was the first of its kind. This is why we have government funded research: to create technologies that would be too risky for any private company to pursue. The question shouldn't be "is it profitable to create the first one?", its "once we've solved the hard problems, can the industry be profitable?".