let me set up a comparison for you, ok?
Here is a quote from another thread here where a member was removed from a Fyrakk normal group right before the boss died and then received no loot but also became locked to the boss for the week.
This is what the GM said to this player:
If blizzard isn’t going to take action against people for kicking others from groups then they will never take action for players leaving groups of their own free will.
A punishment system for mythic plus leavers will never happen and that is a very good thing.