You perfectly got the point - building and maintaining SDKs for all popular languages is very time-consuming, and it also adds a barrier between your project and potential users, who have to get familiar with it, install it, and so on.

But, for sure, having your own SDKs has advantages too - you don't depend on anyone else's protocol decisions, have less dependency, eyc.

Btw, the first time I saw one company use another company's SDK, which I really liked, was in 2023, when DeepSeek used OpenAI's SDK and still think it was brilliant.