The top few are the exchanges learning they shouldn't use accounts this way.....
But the bottom 15 are squatters and fraudsters attempting to capitalize on typos etc.
The top ONE has the following:
So it looks like a squatter too, unless one entity owns both..
And the second balance id includes these:
btercomg, btsercom, bkercom, btercrm, ...
poloniexwlalet, poloniexallet, polnoiexwallet
Actually, it looks as though these are all squatters...