It'd be great if they would, as an extra copy! However, reliance on charity from any single commercial entity would be somewhat against the spirit of the project. Companies (and their PR budgets) come and go.

Archive.org has about 22 petabytes of archived material – and growing. Even at AWS Glacier's cold-storage rate of $0.01/GiB per month, that's $220,000/month, $2.64MM a year.