I've mentioned this before, but some years ago our local crem. held open days for people to come and see exactly how the procedure was carried out. They told us that any valuable metal (gold fillings, hip replacements etc) got melted during cremation and the resulting lumps were sold off to add to their income.
The coffins were burned to ashes, which struck me at the time as an awful waste.
I've chosen a nearby 'Bluebell Wood', created especially for natural burials without a coffin, where silver birch trees and bluebells are planted among the dead, with no memorials or gravestones.
I don't know how this would serve with Corona virus victims though.