Online personalities, like professional streamers, don’t actual reveal their real personalities and identities. They use personas that are carefully curated to grow and maintain their audience. These personas are the brand, that’s what they’re selling. Like sure, you need to be witty and charismatic to draw people in, but that could be said about any job in any field. The same could be said about people changing due to their job. A person’s job is a big part of their identity, and so it makes sense that streamers are influenced by their jobs like everybody else. I don’t see anything that’s uniquely stressful to being a professional streamer.