2 - it matters not what others are doing if avast are complying with with any sanction/embargo.
3 - Even your link says from February 21, 2018 there are limited activation and update of avast. Below is a google translation from that page. It implies that the sanction is imposed by Iran - that however could be incorrect due to on-line translation context/grammar.
Due to sanctions imposed by Iran, Avast has limited the activation and updating of antivirus software to Iranian users from February 21, 2018, and does not provide Iranian users with the rules of this service and use this antivirus only from The IP change path is possible.
