So I sent request to disable double opt-in at Aweber, this is their reply:
At this time, the confirmation requirement for API submissions must remain on. We will need to see that users being added to your list are confirming for a few weeks before we are able to remove that requirement. When people have been clicking that confirmation link and you are actively sending from that account, we would be happy to review this again.
So is it always the case that they can’t disable this feature until many clicks? Thanks!