Online classes mean your child sits alone in front of a screen with an adult you have never met, in a country you have probably never been to, for half an hour, several times a week. That is the part worth asking about, and it is the part almost nobody advertises.
We checked all six websites for a statement that a third person attends the lesson. Only ours makes one. QuranHost says a quality team reviews lessons afterwards, and Online Quran Academy calls its sessions monitored without saying by whom. Neither states that anyone is actually present while the class is running. The other three say nothing on the subject at all.
What we do, so you can hold any academy to the same standard: a supervisor joins every class, about two minutes before the teacher and the child. All of our supervisors are female. Every class runs on one Google Meet link that does not change, so a parent can open it and sit in whenever they want, without asking first.
If you are looking at an academy that does not publish anything about this, ask them directly before you pay. A good answer is a specific one. “All our teachers are vetted” is not an answer.