MS doesn’t care about individual users, use whichever version you want at home.
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We are MS partners and pay them millions of dollars for licenses.
Please do not buy these cheap keys. Just use MAS activator. You can even use their server OS, they don’t care. Even MS support uses MAS sometimes so chill 
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I used Massgrave for activating my Windows 11 iot LTSC 2024.
It’s okay to login using my MS account right?
Yes, and you get a key synced to your account as well, so even if you reinstall windows on the same machine, it gets reactivated as soon as you sign in.
Maybe windows is like amazon.com but for Microsoft, only for public recognition of the company
TL;DR
You def can buy official keys (windows 11 pro key for some 15k) and use them
Other options is that you use KMS to activate your windows, or MAS.
Lastly, you can get it from resellers, who source it from XYZ and sell it out.
Here, you can buy both OEM as well as Retail keys (both worked same as far as I tried them)
These cost between 200rs to 500rs each (windows keys), and work seamlessly.
You can install them during windows installation / go to Activation settings and enter the new key to activate windows to.
They remain even after formats, and also get bind to your MS account.
As long as you are not doing anything that involves bulk of systems using crack keys, you are all chill to proceed in your life.
Office keys, resellers sell these too, no much idea on these as I never sold office ones
Yes. It is ok.
Better use Massgrave than paying for those keys. There isn’t any difference in the eyes of microsoft if you are sourcing keys from NGO’s, Education institutions, credit card chargebacks ( bulk purchased by hackers ) These will all be volume license keys. You will also find some retail and oem keys too. If it is not sold by any official reseller in the chain, Microsoft thinks it is illegally obtained.
Does microsoft care ? No.. that is why windows pro/home etc has now ads etc. The telemetry is different in these as opposed to Enterprise versions and LTSC versions.
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This only applies to home/pro versions. Enterprise/LTSC use a different digital licensing system.