When I buy 1GB of data, why doesn't the remainder transfer to next month?

When I buy 1Gb of data for $5, why doesn’t the reminder transfer to the next month? It’s only fair.

this has been discussed several times before if data rolled over then it would be unprofitable to Republic at the $5 cost (when Republic had a zero breakage system in the old refund plans the data cost was $15 per GB ($7.50 per 0.5 GB))

the only other pay for what you use provider (Google FI) chargers $10 per GB )

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