Streamers won't want to serve directly from their home IP because it makes them a DDOS target.

Ddos prevention never crossed my mind, good point. I don’t spend much time in the gaming community. Who would be the most likely attacker, a competitor in the game trying to get an advantage? If so, thats kinda fascinating in a way. It’s almost like a cyberwar scenario where the battlefield is virtual and physical.

it's both, competitors in the game (or just trolls) have attacked random in-game players using IPs leaked from things like VOIP chat in games (which is often implemented P2P rather than running through the server) and people also specifically go after streamers to harass them.

https://www.eurogamer.net/dead-by-daylight-streamers-are-bei...

Other than the DoS attempts the sibling mentioned, the symmetric Gigabit on a home connection varies depending on congestion, and NAT mapping could change changing your IP causing the whole Livestream session to renegotiate.