Sure is, but there is nothing stopping AMD or Intel from building a working alternative to CUDA, so how is it anti-competitive? The problem with OpenCL, Sycl, ROC, etc. is that the developer experience is terrible. Cumbersome to set up, difficiult to get working accross platforms, lack of major quality of life features, etc.
One example of how they might be abusing their monopoly is by forcing data centers to pay an inflated price for hardware that is similar to consumer GPUs: https://github.com/DualCoder/vgpu_unlock
