That's an interesting story, but irrelevant to this.
Twitter claims that < 5% of their "monetisable daily active users" (aka mDAU) zfd bots, where mDAU is a very specifically defined term, but broadly represents "people that Twitter thinks they can count when they sell advertising". Bots don't tend to buy things, so any bots counted in mDAU is a mistake that will piss off advertisers. (Which would be bad for Twitter, hence why the number matters.)
That there are a lot of bots on Twitter is well known, and clearly true. That Twitter happily leaves most of them alone to do their own thing as long as they don't abuse the service is also well known, and quite sensible.
The question is whether Twitter is good about flagging them as bots. You could have a million bots following you, but as long as Twitter has correctly noted them as bots and not counted them as mDAU, then exactly 0 count as part of the 5% bots.
Nobody outside of Twitter knows who they are counting as part of their mDAU, which means nobody can cross check their numbers.
I’m reasonably sure that these fake user bots that were created for the “buy followers” industry aren’t picked up as bots by Twitter. There’s no reason to allow such users.
It's generally much easier to detect a bot than to detect the purpose an account was created for, so I wouldn't be so sure myself.
Also consider that there's also no reason not to allow such accounts. From a business point of view, Twitter exists to sell advertising. Accurately counting the eyeballs (aka mDAU) they have to sell to advertisers is important, but policing the site otherwise makes sense strictly to the extent that failing to do so may drive some of those eyeballs away.
Consider: No real human beings are likely to quit because of fake followers being left alone, but a few vain people might quit if their fake followers were removed. Further, an overly agressive ban wave targeting bots may well remove some bots people actually like which again, on the margin, may drive some real people away. Like any large company, Twitter will inevitably feel the pressure to play it safe, and in this context that means never banning an account that isn't clearly driving real users away - which means that very passive bots that don't do anything are unlikely to be banned.
Of course, none of that gives us any insight into how accurately (or not) Twitter is counting mDAUs.
If these users are not causing any trouble, getting rid of them seems low value -- and any attempt to clear out a large set of boots will almost certainly got a bunch of non-bot users (unless they could actually get the exact set used by these user sellers)
Twitter claims that < 5% of their "monetisable daily active users" (aka mDAU) zfd bots, where mDAU is a very specifically defined term, but broadly represents "people that Twitter thinks they can count when they sell advertising". Bots don't tend to buy things, so any bots counted in mDAU is a mistake that will piss off advertisers. (Which would be bad for Twitter, hence why the number matters.)
That there are a lot of bots on Twitter is well known, and clearly true. That Twitter happily leaves most of them alone to do their own thing as long as they don't abuse the service is also well known, and quite sensible.
The question is whether Twitter is good about flagging them as bots. You could have a million bots following you, but as long as Twitter has correctly noted them as bots and not counted them as mDAU, then exactly 0 count as part of the 5% bots.
Nobody outside of Twitter knows who they are counting as part of their mDAU, which means nobody can cross check their numbers.