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Disney+ cancellation page crashes as customers rush to quit after Kimmel suspension
(creators.yahoo.com)
This is a most excellent place for technology news and articles.
You have to design for scalability. Bottlenecks may be wherever. Even if their virtual server CPU and RAM can scale up, other stuff may be bottlenecks. Maybe the connection to the DB. Maybe the DB is elsewhere and doesn't scale. Can't really reasonably guess from the outside.
Mass cancellation is not usually a thing they would design around bottle-necks. It also doesn't add value to them.