[tw1984]

please read my reply again, I was talking about AI companies (e.g. openai) are going to build their own vector database when there have a large enough team.

for your question, google built spanner (that was like 12 years ago) and leveldb when it had about 30k people. Meta/facebook forked leveldb and started building rocksdb when they had less than 30k people.

no one is saying any banking, insurance, retail companies with 30k employees should be building their own databases/search engines. They shouldn't. That is actually my main argument - those companies shouldn't get too involved for infra like that, they should just take the offerings of the big tech companies.