Flew home yesterday from MIA
they had bag sizers at the check in line & at the gate
However they did not make anyone use them
At the gate they kept asking for volunteers to check the carry ons for free
They threatened to start checking the sizes because they had a full flight & space was limited
we had a small bag but we did end up checking it but many decided they were not that interested
some had 2 larger carry ons each & were not parting with them
If I fly again I will just ignore the pleas also
they did not seem to pull anyone aside & make them check their bags