Won't the insider builds be activated permanently?
If no, then what is the difference between a USER who is installing Windows 10 Insider Build on a PC that NEVER had a genuine copy of Windows 10...

I have purchased a MSI Gaming Laptop (on Jan 2016) that shipped with Windows 10 Home 64-bit (build 10240..later it got upgraded to build 10586).
Now, may I sign up for insider preview program?
If...