I decided to cancel, but there is no information in the site on canceling once you log in. No cancel button or anything. After searching around I found this site (https://www.efax.com/efax-help-center/billing) which lets you chat with someone to cancel, or you can call. When I first chatted it was directed to a sales person (even though I selected service), so they transferred me to service, but I ended up in queue for the ~7min until they closed. It didn't tell me it closed, I just knew from opening another chat, where it also directed me to the salesperson. The next day, I chatted again and got to a service person, who was slow and gave two separate upsell offers. By the time I rejected these and finally canceled the whole process took near 30 minutes.
Making it difficult to cancel a website is anticompetitive and scammy, and efax definitely meets that bar to get an automatic 1 star in my book.