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/psvQMXEgQsT5RMDTu/consider-financial-independence-first
And on donating now vs. later,
https://forum.effectivealtruism.org/posts/7uJcBNZhinomKtH9p/giving-now-vs-later-a-summary
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?
This would benefit greatly from more in-depth technical discussion with people familiar with the technical, regulatory, and economic issues involved. It talks about a number of things that aren't actually viable as described, and makes a number of assertions that are implausible or false.
That said, I think it's directionally correct about a lot of things.
You seem to have ignored a central part of what was said by Daniela Amodei; "I'm not the expert on effective altruism," which seems hard to defend.
Edit to add: the above proof that signing on to the GWWC pledge doesn't mean you are an EA is correct, but the person you link to is using having signed as a proof that he understands what EA is.
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.