deetrI wonder how long you have to have had an alias before it would be considered easily recognizable to casters. Like what if mason had changed his name to chairuser like everywhere and like his friends knew so he decided to change his ESEA too and then nobody on production knew and couldn't recognize him. In that case he clearly is not intending to infringe on the rule, but he still causes the same inconveniences to the casters and somebody who did intend to use it as a joke (eg somebody who changed their name to xxbongsmoker420xx right before a match). People could end up getting banned all the time accidentally.
The way it works in EU at least is your name is set at the start of the season and you have to have that name in all officials. The only time it's been a "problem" is tonythetiger.