Where do the databases from the "get databases" button in sqli dumper come from ?

[224]

I was dumping some data on a pretty big database I think (20K collumns) and I was curious about the get databes button so I clicked on it and a lot of databases started to appear on the list under the original one. Where do they come from ? And are the accounts on them usable ( because yes I checked the tables of some of them and I found username,password and email collumns) ?

[135]

i dont know XD

[224]

i dont know XD

for example : 

[182]

They should be usable- just more databases to crack. I guess this could be used as a great way to get more combos!

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