Generally, when approached by someone to do something that "requires" collecting, holding on to and working with large amounts of data, I'll point them to this article about Datensparsamkeit
"It's an attitude to how we capture and store data, saying that we should only handle data that we really need."
Typically I'll follow that up with a mention of GDPR and how holding and working with all of this data increases our responsibility and risk, as well as the complexity of our system.
Usually, the "requirement" for giant datasets evaporates reasonably swiftly. But if they still want the data-heavy approach. I'll build it, very carefully.
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