Why growing businesses eventually move to dedicated internet

Shared, best-effort connections are cost-effective because bandwidth is pooled across many customers. Most of the time that's invisible. During peak hours, or when a neighboring business has a heavy traffic spike, it isn't.

Dedicated internet trades that shared-cost model for a guaranteed, uncontended line — the bandwidth is contractually yours, with symmetric upload and download and priority support.

For businesses running cloud infrastructure, VoIP, or anything where downtime has a direct cost, that guarantee tends to pay for itself well before the business is large enough to "need" it on paper.