Almost all my spam at this year, after the summer, has been from Microsoft and even hosted by them.
I could get those messages 40 per day and they all are the same (most of the days only 15 or none). I have reported those to Microsoft and to those image hosting services like a Discord and Zupimages and Github.
No matter I do, Microsoft keep sending those and hosting them.
Before that they did use other services, but I managed to close all of them. It was tons of work reporting that many spam to different services. Got them sites blacklisted to some Antivirus companies too.
I am using spam[DOT]org too, but that seems to be dead.