It is only a good fit if the egress amount is less than total storage, as specified in their FAQ: https://wasabi.com/paygo-pricing-faq/#free-egress-policy

> For example, if you store 100 TB with Wasabi and download (egress) 100 TB or less within a monthly billing cycle, then your storage use case is a good fit for our policy. If your monthly downloads exceed 100 TB, then your use case is not a good fit.