ATINER runs academic conferences in Greece (you can see the members of ATINER's academic council here).  Philosopher Howard Wettstein (UC Riverside) recently wrote to me that he paid "some 1650 Euros in advance" for one of their events, and then "cancelled quite early and asked for a refund. They refused." 

The registration form did provide that they would not refund the "registration fees" because of ATINER's sunk costs, although there was no detail about the actual sunk costs incurred by ATINER, but it surely wasn't 1650 Euros.   Of course, the contract also held them harmless for "Acts of God," like pandemics, but since they haven't been harmed to the tune of 1650 Euros that's irrelevant as far as I can see.  ATINER also invoked recent changes to Greek law meant to protect "tourist industries" from having to provide refunds, effectively shifting the costs to non-Greek citizens for the pandemic.   (Talk about "special interest" legislation!)   In accordance with this law, ATINER is offering only a voucher, valid for 18 months, that covers 2 hotel nights, meals, and activities "not included in the registration."   Will this voucher be usable in the next 18 months?  Who knows? 

It is probably the case that, legally, ATINER can get away with picking Professor Wettstein's pocket for the full amount, and they will get away with it legally with respect to many others as well.  It is also the case that academics can, legally, boycott ATINER and refuse to do business with them ever again if they are really going to take the outrageous position that the entire amount is now lost to the coffers of ATINER.  If someone wants to create an open letter or petition about this, let me know.  For the time being:  boycott ATINER!