It's risky -- it's hard to compete with 'free', because it takes no money and very little effort. If Twitter charges even just a little for influencers to post

It's risky -- it's hard to compete with 'free', because it takes no money and very little effort. If Twitter charges even just a little for influencers to post, lots of them will just shift more of their announcements to Facebook status updates -- a somewhat similar feature of the other social app everyone already has installed. Despite no one platform offering exact feature+UX parity with Twitter, there are several other free platforms that are good enough for people. If Twitter makes changes that make posting on it harder, its still-organically-growing competitors could see an influx of people who will choose to abandon Twitter.