That “could” work. If they went after the angle of creators and influencers and let the subscription paywall out the riffraff they could rival Patreon or Pinterest. More content based (webcomics, how-tos, inspirational quotes, etc) rather than relying on social media battles to drive clicks and show ads.https://www.macrumors.com/2017/03/24/twitter-paid-subscription-tier/
Never happened but it'd be nice. I wanted to pay Twitter 10 years ago for their service so long as it was ad-free and supported a better quality of service but it's been proven that social networks fail when they charge for it.