Data usage from my Starlink app for reference purposes. Turned it on for the month (50Gb plan) and drove ~18 hours round trip from DFW to Starbase and back. Both kids streaming something most of the way, the wife surfing on her phone, and Google Maps on my phone the whole way. All in used ~29Gb.
The big difference between the $50 & $165 plans is data priority. If you're in an area with a ton of receivers (major metro areas and close by) and need to maintain business like speeds for large data sets, then the unlimited plan makes sense. If you just need high speed data for streaming/video calls, especially in remote areas with few users, then you're paying the same price on either plan up to 165Gb. Just opt in to the $1/Gb overage fees and monitor your use in the app.