I don't think anything is stopping you from using IM/irc/chat. The problem that video screenings solve isn't one that you face. For example, Thunderbird School

I don't think anything is stopping you from using IM/irc/chat. The problem that video screenings solve isn't one that you face. For example, Thunderbird School of Global Management, a top international MBA program, is planning on using Active Interview as part of their admissions process. They're letting applicants answer a video questionnaire to replace 1 of 3 essays. It's purely optional. They have a full admission team of 10+ people, working full time traveling around the world screening applicants. Using a tool like AI saves tons of time and money in the early screening stages. Unless you are a organization like that, you won't truly feel the pain that Active Interview or Hirehive solves.