I'll just chime in that my card has been hacked 4 months ago with no email warnings received from Renderosity, even after checking the spam folder. Then again just two weeks ago, the new card was blocked by the bank for no apparent reason, but I have been shopping here a few times with that card in 2017, before it was blocked. Still heard nothing from Renderosity. Then I actively search and find this thread.

I'm not sure what else to say, other than if you think there are problems, it's best to send out emails unconditionally to all users as a safety measure along with changing all passwords.