Another argument for birds is that the relative positions of the individuals in the group are changing quickly and substantially. A drone swarm almost certainly wouldn't be programmed to behave that way.
Looks more like a flock of birds from the behaviour in the fleeting couple of seconds where we actually saw something. Phones are really rubbish a taking this type of picture. You have no idea if they’ve focused and what on with no idea which...
Thus far, I only see two groups of drone users who are against R.I.D.
1. Ones that are absolutely up to no good.
2. Ones that are paranoid
3. Reserved for a new group TBA
😴