How much more likely to die of covid, given that you are already infected with it, are you when you have no access to medical treatment compared to when you have access to full medical treatment including pure oxygen and intubation as needed ? I couldn't find any information about this anywhere. Feel free to assume an age of 60 years and no comorbidities (i.e. perfect health apart from being infected with covid).
https://www.forbes.com/sites/theapothecary/2020/10/06/what-is-your-risk-of-dying-from-covid-19/?sh=116da1e61592 is very much more to my taste than most articles about covid, as far as it goes, but it makes no mention of what effect on your chances of dying the lack of medical treatment has nor about a hypothetical lack of pure oxygen and/or intubation equipment in the hospital where you would be treated if you got seriously ill from the covid that you are infected with.