I didn't, it was still free back when i got my account.
I'll see if my school lets me have a developer account, but if it's limited to only 1 free account per student I'm probably going to need it later.
I want to get RetroArch on my Xbox One S in Retail Mode, since switching between Retail and Developer Mode takes a long time. The problem being that I don't want to risk my Developer account getting banned if I upload it myself. I can't buy another Developer account because I don't have any way...