Somewhere between zero and 16. There is no "usually" for me.
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Re-read the comment you originally replied to. Music selection is too small for me.
I do, but the company is based in Paris as far as I know, so it's European. At least most employees are (probably?) around there, as are the paid taxes (assuming they pay any).
Given my experiences, I don't think I have any other option that wouldn't be just a way worse experience for me. There's a reason in dropping Spotify after all.
I also gave it a try, but had to cancel my plans to switch due to limited music selection and playlists lacking folders.
I am currently trialing Deezer, so I guess that still counts. Also can't do folders for playlists, but basically all my music transferred over.
There's also a dedicated recipe in "bottles", which I think is based on it at least in part. As I'm trying to move away from fusion, I haven't tried it yet though. Apparently it can work, but can also randomly break with updates...
There's also In shape, which has it's down sides (some go away with money), but also runs anywhere bring browser based. One of the more obvious down sides is that it's by definition cloud based.
There has been a lot of advances even with Nvidia in recent years. Assuming the GPU in the laptop is semi-modern (not sure if it's 10xx or 20xx and newer, but one of those), you should be able to just install any modern distro and it should just work. This is especially true for gaming focused distros (like CachyOS), which doesn't have to be used for gaming btw. They will auto-detect just fine in the installer and there is zero effort or tinkering required.
I bought 48 GB DDR5 for my laptop back in September, just before the prices ignited their rocket engines. I paid 120€ I think. Prices now are like 500(ish). Truly insane.
There are KVM switches that allow something closer to that at least, but usually only for 2 hosts (pcs). It stands for "keyboard, video, mouse" and they originated in the server space, but recently became common in the home/office as well.
They main purpose is to switch use of the monitors and any attached input devices between PCs. But there are models that allow mixed/shared use as well. If you're looking for one that supports 3 monitors and 3 hosts, with some splitting options, that might be harder to find or cost as rather pretty premium (hundreds).
Yes, and all the download sites and tools don't use anything else either. They all just wrap yt-dlp.
If it stopped working for you, you might have to read the docs on the specific error you're getting to see how to get around it. YouTube does try to make it harder, but it's technologically difficult to fully block. There are workarounds for basically every case as far as I'm aware.
Just using yt-dlp also works, but locally.
Doable, not practical. Another major concern is the induced dizziness and general discomfort from such a small circumference. If you stand up straight, your head moves significantly slower than your feet. There are more effects that humans don't do well with.
In addition keep in mind that this implies significant mechanical complexity the moment you don't rotate the whole craft, but only a section or ring. If you do rotate all of it, simple tasks like taking a photo become... cumbersome.
Also like others have said, it's not a permanent residence for anyone, and the main goal of the ISS is the study of low- or micro-gravity.