Question about doing this as a side gig

I’ve got a friend who currently works a full-time 9-5 style job, but due to some life changes they are looking for a “side hustle” that isn’t too terribly stressful and something they only have to do a couple of hours on some weeknights.

They have a BA in English and have some teaching experience, so I thought that maybe doing online teaching/tutoring would be a good use of their prior experience. Is Cambly a good fit? I’ve also seen programs such as Preply. I understand there can be some competition, and some complications with rates and commission.