It’s weird these companies grow this big. How many software engineers do you need to monthly bill a list of people and transfer it to a different list? That’s like a single person saas.
If I had a nickle for every time someone on HN claims that a sizable company could be replaced by 1-5 devs, I'd have enough money to start a competitor to most of them that did it better with more devs/staff, as evidenced by the general lack of 1 person saas companies out there that solve more than a very niche problem.
Teams, Google's VoIPs, Skype, Ventrilo, TeamSpeak, Zoom