This is an interesting view on camille by @reveur:

Regarding the bots in the botnet you might have noticed they never post.
thus reputaion will never increase as it only increases when someone with a rep higher than yours and enough SP votes your content.

They dont post to avoid that all flaggers in steemit downvote their post and therefore thay cannot loose or win reputation.

On the other hand they will by powering up the dust (0.001) tranfers grow over years so some meaningfull SP but mathematically if they received 0.001 a day (this is a tenth of a cent of steem) they will need three years (1000 days) of daily memo dust to achieve 1 SP...

It is true that steemit is delegating some small amount to them but even then they remain pretty much powerless, remember that also dust transactions (votes and the such) are mostly non taken into account, so they will need to hit you with 1000 accounts to actualy remove 0.001 rewards from your posts.

They from a witness point of view bloat the blockchain with their thousand of transactions (for the blockchain each action from an account counts as a transaction)

A tipical vote is written in the blockchain like a JSON object:
{voter: xxxx, percentage: 100, votee: yyyy
(not exactly but lose)
count the caracters and multiply by the number of votes by the number of botsand that is the amount of bites the blockchain grows due to their activity.

So still not enough for those who can do something to act... and to be honest there is not much anyone can do without breaking the blockchain principle... Steemit could in a HardFork disable the accounts but that is like the worse blockchain SIN anyone can commit, because who decides who is next.... This is a weakness of the blogging blockchain platforms where damaging users are protected by the blockchain credo.

It is technically possible to disable the accounts but then everyone will feel unsafe to have funds in case it happens to them.