Dear Audiofanzine.
You CAN get Garageband for PC, it's HERE....
https://garagebandonpc.com/
Works well, too, I don't personally like it, but that's just me. Nothing wrong with it as a piece of kit, I'm simply weird!
Thought I'd put this correction here so PC users can have a go. I BELIEVE - might be wrong, stranger things have happened(!!) - you can actually import Mac-created Garageband files into the PC version, the same way you can import PC created MIDI files into MACS (Oh yes you can, done it!)
Hope this helps.
Yours respectfully
Chris.