Common for students to have only written classes?

There's a student who wants to have classes in chat where I explain things and they answer and do exercises, I guess they are uncomfortable with video or speaking classes. We've had classes like these before and they went well, the student confirms the classes as well. There's no call.

Is this alright or something I could get in trouble for (I don't even know if that's even possible.) Tutors I've talked to have said it's common for some students.