I imagine that when a naughty vandalism account (I mean subtle vandalism, like changing the dates of historical events, changing the names of characters and so on) is discovered, all the edits get removed by some mechanism.
And idea: an account that makes 4 bad edits. A second account that comes in, reverts the bad edits to good ones, then makes 8 bad edits. A third account that reverts those 8, and makes 16 bad ones.
And so on. Some method of automating this would have to be found. Then any good vandal-hunter who reverts the work of any of these accounts, has now reverted back a third of the edits to bad ones. They could technically undo this by uncovering the other accounts, but it would be a lot of work - and after all the point of all this would be to create such an administrative burden that Wikipedia would finally abandon the policy of 'anyone can edit' to a more sensible one.
How do bot accounts work? Does any techie wizard here have some sample programs?
All theoretical of course - the Damian brand is to cause disruption by strictly legitimate and constructive means.