I don’t care about growth

Article isn't interesting but I checked out the site and whoever wrote https://usefathom.com/high-traffic doesn't know what they're talking about.

Lambda isn't infinitely scalable, it's literally finitely bounded by the number of concurrent executions (which has an unpublished hard limit). You could definitely hit this with smthn like page views.

Also, the copy brags about SQS FIFO, but FIFO queues are much less scalable than regular queues. They are limited to 20k inflight and 300 TPS for WriteMessage.