Alex and Syd left the channel twice. once when Drea left and again when Tori left, because they couldn't handle negative comments. At the first sign of criticism, they were out the door, wanting only praise for their work. Alex, who runs three businesses, enjoys the money from GP but isn't dependent on it and could leave anytime
They stayed after the other girls, especially Bells, had a serious talk with them, explaining how essential they were to the business and that GP cannot exists without them. Alex wouldn't really care if the channel dies, but it won't be easy for the rest of the girls
Take Natalie for example, she left and started her own channel, but how many people were watching? Maybe 20, 30 tops. She hasn't streamed in like 2 years, and that's because people wanted more from her. I know people who said that in GP, she showed cleavage, but now that she's solo, nothing. But Natalie said she's not that kind of girl, she didn't like when people oversexualized her and preferred being herself. well, don't expect a ton of viewers just by talking about your day, playing video games and just showing your face. You're not going to get far like that, sweetie
As for Syd, she's not streaming as much as the other girls. She prefers to work behind the scenes, handling tasks like operating Patreon, managing the schedule, etc. She's aware she's not that entertaining, but she's got big tits, so who cares? She knows what the internet wants and what the majority of viewers are there for