I held off on Windows 10 for as long as I could until Adobe, and therefore my job, required it. Now this nonsense. I hope this isn't the start of them joining on the web DRM bandwagon.
Foxit Reader has decent PDF editing built in. I use it all the time. I think they call the pen mode "comments", but you can also load your signature as an image file.
The only time I use (pirated) Adobe Acrobat is when I need to edit existing content in PDFs, like fixing layout or editing text.