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"Only" 23% of users.

Still, I could see the argument that some users are better than others and the most engaged ones are more likely to get a third party client.

Which means either Twitter loses those users eventually or coerces them into using their first-party offerings.

It will coerce/force a % of users to use the 1st party apps. It will also allow them to focus on media platform features without the distraction of pleasing 3rd party devs (at the moment). I am pretty sure they will improve that side AFTER they have finished being a destination platform.

Existing clients are grandfathered in, as far as I can tell from Twitter's blog post.