Please add a command to bulk vanish people. Such as allowing the command to use @a. It would also be nice to add an argument so you could do /vanish @a set true so you can have command blocks automatically set everyone to true every tick.

added in 8e9278a and b723a3d

/execute as @a run vanish can be used as a player.
Somehow doesn't work with commandblock.

Might look into it in the next days.