I doubt T-Mobile is intending to compete with people who have fiber internet. Think about all the places limited to DSL (or worse).At 60/month (just $10 more), I am getting 500-1000 Mbps down from ATT Fiber with close to 5ms latency.
TMo Home Internet just can't compete.
By comparison, I have "options" of ~45Mbps DSL or maybe ~500Mbps cablemodem. My ~150Mbps service for $80+ could see some competition from mobile internet.