It’s not that subjective anyone using twitter still sees spam accounts promoting a website, business, product, or scam on every post. Twitter just said they remove 1M spam accounts each day. Their mDAU is claimed to be around 200M. This means they are deleting around half a percent of their users every single day. That seems like a lot to be identifying to me, but doesn't really determine if they are deleting enough or not but does show me that being higher than 5% is very possible when you have to delete that many accounts every 10 days.