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The other factor to consider is the type of users now joining.
As you're both more than aware, Twitter is a very different beast when it comes to how users post and interact. A significant proportion of the new user influx come from the rowdier, punchier bubbles on Twitter - politics (UK, EU, US), anti-Brexit, anti-Trump, and left leaning generally. All quite peaceful at present, but if politically right leaning users join, moderation will become ever more challenging.