This is a common misconception. For almost all residency permits, you must apply from the United States. You are not allowed to apply while in Spain. There are exceptions, but not many. Though, with the new digital nomad visa which did not exist when I moved, it is possible to apply while in Spain. But, it most likely will not be issued within 90 days. I have many friends that have done so and are forced to live illegally for a period before it gets approved. I've never seen a single residency permit get issued within 90 days (other than student visas). The Govt. is EXTREMELY slow. Much more so than the U.S. even. Even our renewals have taken much more than 90 days each time. The easiest option that some people do when in a bind is to enroll in Spanish classes and get a student visa--that one can be applied for in country and is relatively 'fast' (in Spanish terms).

'to firstly get a residence permit in Spain, then go to Portugal and apply there, and live in either country until Portuguese one comes out.'

For most residency permits (in Spain) you have to physically be in the country for more than 183 days (half of the year). So this is not possible (unless you want to switch back and forth). Your renewal would not be approved.

Edit: Though, if we did it again we might consider Lisbon. I'd never been until recently and it's pretty awesome. And there are other benefits/ease.

This is great. I think there's a body of research to be done regarding the creation of self in the age of social media. (Not just creators but everyone)

How do I know who owns/controls a wiki on Fandom? Or is that not the right question?

Yes, you do have to pay Spanish income and wealth taxes (though the wealth tax varies greatly depending on where you live in Spain, for example it's zero in Madrid). However, you don't get 'double-taxed' on income. You only have to pay either U.S. or Spanish income taxes, whichever is higher (almost always Spanish).

I am telling everyone who asks me, which is a lot right now as you mention, to wait for a bit if they can because Spain is 'any time now' supposed to be approving a digital nomad visa will will make the process MUCH more simple for people who are working remotely. The details haven't all be ironed out yet but: https://www.thehomelike.com/blog/spains-digital-nomad-visa/

Healthcare here really is wild. Our first month here my wife got extreme food poisoning and had to take an ambulance to the ER. The ambulance took her to the public hospital because it was much closer to our house compared to the hospital of our private insurer. She spent a few hours in the ER, including the ambulance ride, it cost €138 out of pocket (since we aren't on the public system). And, get this, our private insurance company reimbursed us for the cost. It's a completely different world.

Further, "there are better ways we can go about talking about race and culture, and having respect for one another, without making it about the oppressed and the oppressor." - How so? Why do we need to teach students to have respect for one another if not for a long history, and complex present, of one group of people oppressing another? If there was no historical and current oppression, the entire conversation wouldn't be necessary in the first place.