In my opinion, of all the online education providers Coursera grew the most during the pandemic. They also reacted well by offering free certificates and giving free access to their catalog to college students [2].
My company Class Central [3], a Tripadvisor for online education grew a lot during the pandemic. In the second half of March, we received 5 million visitors, almost a 20x increase. Though no longer the peak, we are still at 2.5X of what we were before.
1. https://www.classcentral.com/report/coursera-monetization-re...
2. https://www.classcentral.com/report/mooc-providers-response-...