I reached out to Adobe Illustrator Support to answer your question. Here is what they replied:
“It will be $33.99/mo per user – and each user can install on 2 machines and can use 1 at a time. So 3 licenses would be $67.98/mo. Also, if you would like to go for the all apps plan, it would be $79.99/mo and you will get access to all the apps”
Hope this helps answer your question.