Long-term followup
After a few months I dropped out of being a storage node. Storj charges their Tardigrade customers for storage size and download size only, which is an incentive to use it as a continuous backup service. I was seeing 60 to 140 GB daily of free inbound traffic that never added much to the total storage that pays. Five months of this amounted to 4TB of storage that paid a few dollars a month, but in a questionable cryptocurrency.
See https://forum.storj.io/c/sno-category/10