Weights & Biases goes way back to 2017, before deep learning was called "AI". It's used for all sorts of non-AI ML too. It may be used for lots of AI but it sees a ton of non-AI use too. It's definitely not my thing (I prefer MLFlow) but lots of people love it.
it's because this is just unverified slop that i doubt was thrown together by a human. Langfuse has ongoing conferences and is still used by many frameworks.