Yes, Roamify sells unlimited data eSIM plans for the Czech Republic. The plans have a data cap listed as Unlimited and their validity ranges from 1 day up to 15 days, with prices that vary accordingly from about $2.23 for the shortest plans up to roughly $32.00 for the longest.
Each unlimited plan allows tethering and indicates that speed may be throttled after heavy use, which is the standard Fair‑Use‑Policy approach. If a traveler wants more detail about speed limits, the amount of data that remains at full speed, or how the throttling works, they should contact Roamify directly for clarification.