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For all we know they're using the Free plan: cloudflare.com/plans/#overview Cloudflare earns their real money from their metered services: load balancing, workers and other parts of it. The web reverse proxy has unlimited bandwidth even with the Free plan and isn't expensive itself.
Not sure off hand if Cloudflare still generates shared certificates with up to 100 domains in each for people using the lower tier plans. They have a single subjectAltName for their domain in the certificate but Cloudflare might toggle off sharing certs for controversial sites.
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