It depends which side of the argument you want to believe. The theory is that there are players in the amateur game that are capable of representing their country at amateur level but play in comps that are not organised or administered by BARLA. I mean guys in the military, students, Rugby League Conference, and Wales and Scotland. They can't play for GB because they ain't part of BARLA.
So the RFL (with full co-operation of BARLA) set up a new team GB Community with players selected from all aspects of the amateur game including barla, etc. But now BARLA have thrown a paddy because some ex-pro players now play in amateurs and are eligible for GB Community Lions. BARLA are very precious about the whole amateur thing (which is insane given the history of RL) and have withdrawn approval of the GB Community team.
It's just more bullsh*t from BARLA who don't seem able to accept that times have changed and the game has changed. They did fantastic work in the past,and 95% still do, but so many of the people at the top end are jealously guarding their own positions and protecting their little kingdom.