In a nutshell, there is no data cap on the base Visible Plan. Your traffic is simply prioritized behind others during times of heavy network usage.
The Visible+ plan gives you 50GB not being subject to prioritization - i.e. premium data is data not subjected to prioritization.
The topic is covered along with other limitations at: https://www.visible.com/legal/legal-disclosures
200 Mbps is not a data cap that's a speed cap for the Visible and Visible Unlimited Plans when on 5G.
Visible+ is 5G speed is capped at 5 Gbps.
FWIW, in ISP-speak, "Unlimited" only refers to the amount of data you may use. Use as much as you want subject to other limitations based on plans being offered.
Here is the summary:
Visible (base) Plan -> No premium data -> de-prioritized data -> No cap on data volume -> Speed capped at 200 mbps for 5G data -> $30/month
Visible+ Plan -> 50 GB priority/premium data -> after exhausting 50 GB unlimited de-prioritized data -> No cap on data volume -> Speed capped at 5 gbps for 5G data (25x higher cap than base plan) -> $45/month
P.S: Please mark this as solution if it helped you.