Windows 10: Is it legal to buy cheap Windows 11 Pro from these websites?

Microsoft is selling swedish Windows 11 Pro for the price 2399 SEK:https://www.microsoft.com/sv-se/d/windows-11-pro/dg7gmgf0d8h4At prisjakt.nu which is a very well-known swedish website for finding best prices, you can find MUCH cheaper prices.That website is generally considered as a serious website so it would be surprising if they sell illegal software.On the other hand, it is also difficult to understand the HUGE price differences. I have used the below URL: https://www.prisjakt.nu/search?search=windows%2011%20pro&sort=lowest_price%3Aascand there I have found the below prices for Wind

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Are cheap Windows 10 Pro OEM Keys illegal to buy & too use?

I've recently been seeing a lot of popular YouTube creators who are being sponsored to make videos to promote a website called ucdkeys, where you can buy cheap Windows 10 Pro OEM CD Keys for only £10 ~ $16. I simply ask this, are the Windows 10 Pro OEM
keys this website sells legal to buy and can they be used legally by a non-commercial user?

 

Is this website legal.

Is hypestkey website legal. As they say that they are partnered with Microsoft so I want to ask can I buy windows 11 pro key from there website.

 

Is it legal to buy a cheap Microsoft Windows key from any online store?

I was looking for Windows 11 Pro on google but when I was searching I saw there are lots of websites that are selling Microsoft Windows 11 Pro at very low price very low prices rather than Microsoft. As an example, There is a website called MSCDKEYS, They are selling Microsoft Windows 11 Pro for only 40 bucks while Microsoft Official Store sells it for 200 bucks. So now I have a question on my mind, is it legal to buy from outside? Are they scammers? How they are selling at low prices? If I buy from them is it going to work well? Note: If I can save some money then it would be great for me.

Thanks in advance mates