Nothing comes for free, so what's the profit angle to do this? Government is the obvious customer, but that would leave a papertrail too if such deals were worked out especially asking for perpetual storage until the heat death of the universe.

The cost comes from your tax. Surveillance has an unlimited budget.

You can store an ungodly amount of data if you convert everything to metadata, e.g store a face picture for a short period of time, create a hash to match against other faces in the database. Same with license plates.

Using the metadata alone could effectively completely track your whereabouts.