This was because Skype’s file transfer was Peer-to-peer, so it wasn’t Skype itself hosting the files. While discord is actually hosting the files, which is much more costly.
Well discord could offer P2P option with no limit…
But then they can’t force you to get Discord Nitro.
P2P vs hosting…
Right, so many sites try their hardest to have every thing hosted on their own platform, then they put stupid High restrictions on what you can actually do with the content because of the fact that they’re now having everything on their own host. Switching from peer to peer to Cloud hosted was in my opinion the beginning of the downfall for Skype. It removed a lot of its permissions that you could give on the platform, it broke compatibility of the Unix Community which took them two and a half years to finally fix, and it actually butchered their reliability
