Today I was explicitly offered free checked carry-on bag after I chose to check zero bags during the online check-in process, at around T-22h. Ticketed in full J, as an SE. Flight is J0 Y9, A321 fin

Not sure if this offer is new, but I've never triggered it before, despite being on 100% full flights with same status. This is great news for all if it entices would-be economizers to reduce the pressure on cabin space. Suffice it to say, I personally did not participate in this amazing offer.