Supposedly it’s not applicable to R2, but their Enterprise egress pricing is around the $0.05/GB rate. They won’t contact you though until you start to get close to the $5,000/month usage level, which itself can be a problem as your fee goes from $0/month to $5,000/month.

R2 still has per-request fees which, given PUTs are still $4.50/million and GETs $0.36/million (only about 10% off S3’s), they still have significant margin there to cover egress for objects of reasonable size.