Do we actually know the clouds will do this? S3 is just about coming to its 20th anniversary. Long enough to experience data rot to a small degree but realisti

Do we actually know the clouds will do this? S3 is just about coming to its 20th anniversary. Long enough to experience data rot to a small degree but realistically what proportion of users have archived things away for 10+ years then audited the fidelity of their data on retrieval after fetching it from Glacier