this post was submitted on 22 Jul 2023
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Napkin maths to illustrate the point: Steam's game IDs are short numbers, typically close to 5 digits long. ASCII characters are one byte each, so let's assume 5 bytes plus one more for a separator character per game. If you wanted to store 8 billion accounts with 50 games each then the IDs would be about 2.4 TB, so a consumer hard drive worth ~$100 would do the job at least in the raw terms of data capacity
Your sums are right, but a 'hard disk somewhere' is not a robust, always on-line database. Running a 3TB Postgres instance on Amazon RDS will set you back something more like $1k/mo. Still absolute pocket change for Ubi, though.
https://calculator.aws/#/addService/RDSPostgreSQL