I highly recommend reading this article:
Friends Don’t Let Friends Use Ollama — Sleeping Robots

Ollama’s convenience no longer outweighs its drawbacks. It obscures its reliance on llama.cpp, can lag behind other runtimes in performance and model support, and adds friction through its model packaging and configuration. I’m also concerned by its cloud pivot and the distinction between local and hosted inference. For more control and broader compatibility, I recommend trying other runtimes that better fits your hardware.