The use case behind these kinds of terminal/editor sharing over the browser is to allow other individual to interact with your instance. This is good for remote debugging especially. Additionally video calls are susceptible to quality drops which make screens harder to read sometimes. This simply transfers the text as opposed to a screen grab.

While tools like zoom allow remote desktop control, it still has lag, and the requirement for both parties to install software as opposed to just the sender in the case of this tool.