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a) Nobody cares about container registries.

b) There are dozens of alternatives so AWS isn't going to be a monopoly nor impede competition.

They care, they just don't know it yet. Almost every container pulls from Docker Hub (the base images)

Your point a) gave me a good laugh. It's going to be a while until courts/lawyers/public care about nuanced topics in software.

Except other competing services also run on AWS, and have for years (some depend solely on AWS, like Heroku; others are multi-cloud, like MongoDB Atlas)

There are TONS of companies running on AWS that face competition from AWS. Snowflake just IPO’d. They run on AWS and sell a data warehouse service. AWS also has its own data warehouse called redshift