I’m not a doctor but this is my understanding:
- Homeopathy practitioners believe that the potency of a homeopathic medicine increases with dilution.
A homeopathic medicine of 1C potency is made by mixing 1 part active ingredient with 99 parts distilled water/ alcohol. So the amount of active ingredient in 1 unit of 1C medicine is only 0.01 (or 10^-2) parts of the initial quantity.
A homeopathic medicine of 2C potency is made by taking 1 part of the above 1C medicine and mixing with 99 parts distilled water/ alcohol. So the amount of active ingredient in 1 unit of 2C medicine is only 0.0001 (or 10^-4) parts of the initial quantity.
If this is repeated 1000 times we get 1000C medicine which is 1M.
So 1 ml of Camphora 1M consists of just (10^-2000) ml of the active ingredient. Just imagine the no of zeroes. By this logic, 1kg of Camphor can be used to make 10^2000 litres of Camphora 1M !!! One might as well go for alcohol manufacturers if alcohol is the diluting agent used in Camphora 1M. 
This is the theory part as per my understanding. Please correct.
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Not sure whether Camphora 1M is being used against Coronavirus as widely as indicated by the media. In fact I don’t even think there are too many people who believe in homeopathy. Having said that, Arsenicum Album 30, Gelsemium 30, Bryonia 30C etc are also recommended medicines against Coronavirus.
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Not all of the homeopathic medicines sold in India are manufactured here. Lot of it is imported from Germany.