1. Very expensive - why do you care?
2. Opinionated - not necessarily bad, and can be tuned.
3. Politically biased - that's a bullshit criterion. You want a tool that's reasonably objective - being in the middle between the two current political extremes is different from being objective.
4. Doesn't learn new skills - it does.
5. Controlled by a small group of people - that's why there are other implementations of LLMs.