Experience, mainly.
I used to run a phpbb forum, on average the bot signups outnumbered the real people 10 or 20 times. And that was with some fairly robust anti spam measures in place - something I think this platform is too new to have properly sorted out yet.
I may be wrong, I don't know how the back end here works, but any place where people can post publicly will be infested with bot signups very quickly. The only real variable is how good the anti spam measures are.
It's the one thing that all (or most of us, I guess) have in common; we're all here because of what's going on there. It's natural to want to talk about it.
It'll pass; I'm already seeing a lot of non-reddit content on my home feed now, whereas day 1 it was probably 95% posts of the sort you're talking about.
I saw the same. I was just about tempted to slide back and browse quickly on my lunch break, then I saw that and just noped out of there. This place is building up quickly and strongly enough that I probably won't bother going back to reddit if he's going to keep up with this nonsense; I don't really need that sort of BS negativity.
It went about as expected, IMO. 90% of redditors just don't care that much - even if they agreed with the blackout in principle, most of them were likely just waiting patiently for their favourite subs to reopen so they could go back to browsing as usual. A quick browse through some of my subscribed (and still open) subs revealed a lot of commenters weren't even clear about what was going on.
But it has had the effect of essentially kickstarting a community here which seems to be taking shape nicely and there's finally a (small but growing fast) alternative to reddit - which didn't really exist before. I can see the following months and years seeing a gradual shift in user base from reddit to here.
Reddit's not going to die overnight; that was never going to happen. But it's possible it's the beginning of the end of their empire and the slow decline to the ranks of the remember-that-website-whatever-happened-to-that club. Time will tell I guess.
I got rid of my icon ages ago - one of the great strengths to me is the ability to customise the taskbar as you see fit, you can remove literally any icon you don't want there. Even the URL/search box if you want.
About the only time I see anything pocket related is when FF updates and there's some blurb about it in the 'new features' page. Otherwise I pretty much forget it exists.