Ok, so I found a more "official" link to this keep-your-free-storage promotion:
At least it comes from an admin on OneDrive forums...
There's no way I am following that link.
I looks exactly what you say it isn't: fishy. After 1 click it is asking for permissions to access accounts, instead of a login. Seems VERY suspicious.
If it was legit, you would provide a link to an official Microsoft site with the news, which would then link to the onedrive site, asking for the login, not weird access permissions.
There's also no information on the official Onedrive blog: https://blog.onedrive.com/
Thank You Very Much "GSMArena Team". Always a first point source of any Tech news on Mobile Tech space.
Thank you GSM arena!
If you hadn't posted this I wouldn't have known about the changes.