wondering whether the fan really draws all the air through the filters

It doesn't need to. If only 90% goes through each time, it's incredibly effective, since it's getting through all the air in the room many times each hour.

I'd do that, but for $1000 / $2000.

Median, above 6%, but I'd take a bet with reasonable odds for >8% before end of 2027.

I'd certainly bet on higher US unemployment by 2027, in part due to AI automation.

Now, if you own a house, you can demand that other people obey you or leave your house. But the state does not own the country; no one does. 

By what authority does such ownership exist? Because at some point, we're arguing over which social structures (ownership, government, negative rights) are good or bad, and I don't see much justification to draw the line where you choose to.

Other answers are very much on point, but I want to flag a point others are not focused on.

While I’m currently living with my parents and paying $700 per month in rent, I’ve been thinking seriously about saving more aggressively now that I'm just starting my career.

You should absolutely be doing this, and it should be a focus. I don't think it's a reason not to donate, but this has been discussed several times before.

https://forum.effectivealtruism.org/posts/ZXQ53du9sBjLZs5XB/how-to-balance-personal-savings-and-giving

https://forum.effectivealtruism.org/posts/psvQMXEgQsT5RMDTu/consider-financial-independence-first

https://forum.effectivealtruism.org/posts/w9ENDad268PT9KnWn/thoughts-on-personal-finance-for-effective-altruists 

And on donating now vs. later,

https://forum.effectivealtruism.org/posts/7uJcBNZhinomKtH9p/giving-now-vs-later-a-summary 

Yeah, I was mostly thinking about policy - if we're facing 90% unemployment, or existential risk, and need policy solutions, the difference between 5 and 7 years is immaterial. (There are important political differences, but the needed policies are identical.)

I agree that better understanding of progress and which problems are more or less challenging is valuable, but it seems clear that timelines get fare more attention than needed in places where they aren't decision relevant.

You very much do not know what you are talking about, as that linked "explanation" makes clear.

I'm not sure if you're honestly confused, or intentionally wasting peoples time, but either way, you should spend an hour or two asking 4o to explain in detail why an expert in AI would object to this, and think about the answers.

Yeah, you should talk to someone who knows more about security than myself, but as a couple starting points;

math-proven safe AIs

This is not a thing, and likely cannot he a thing. You can't prove an AI system isn't malign, and work that sounds like it says this is actually doing something very different.

You can do everything you do now, even buy or rent GPUs, all of them just will be cloud math-proven safe GPUs

You can't know  that a given matrix multiplication won't be for an AI system. It's the same operation, so if you can buy or rent GPU time, how would it know what you are doing?