Companies usually offer a service or a product. If the company doesn't deliver what was agreed upon, then the customer can demand correction. If a taxi driver takes a needlessly convoluted route, charges too much, or doesn't bring you to the destination, you can complain to the taxi company. If the laundry didn't work, you insist on doing it again.
However, many activities are inherently fraught with risk or uncertain results since there are always things outside of anyone's control. A lawyer can't promise you prevail in a court case, but they have to advocate your case to the best of their abilities. A doctor won't guarantee that you become healthy again. No taxi driver will guarantee you that you will reach the destination in time, but they will bring you there. Atlassian won't guarantee you will meet a release deadline if you use their managed JIRA instance, but they will do their best to prevent data loss. And a company that basically sells access to a chatbot won't guarantee that it gives you correct results. Maybe availability guarantees.
However, many activities are inherently fraught with risk or uncertain results since there are always things outside of anyone's control. A lawyer can't promise you prevail in a court case, but they have to advocate your case to the best of their abilities. A doctor won't guarantee that you become healthy again. No taxi driver will guarantee you that you will reach the destination in time, but they will bring you there. Atlassian won't guarantee you will meet a release deadline if you use their managed JIRA instance, but they will do their best to prevent data loss. And a company that basically sells access to a chatbot won't guarantee that it gives you correct results. Maybe availability guarantees.