Looks to me as if Fastmail made a mistake (anyone can make a mistake) and then apologized to you for that mistake and gave you a year’s free service as a part of their apology. Seems pretty honorable to me — more honorable than the cut throat way PolarisMail seems to be trying to proselytize users from Fastmail. You just persuaded me to try Fastmail as the more honorable of the two. Integrity carries a lot of weight with me.