No, abesteSIM does not provide an unlimited‑data eSIM for Belarus. All plans for the country list a specific data cap, the largest of which is 20 GB.
The provider offers fixed data plans, such as the eSIM Global 20 GB plan valid for 30 or 60 days, and the eSIM Global 10 GB plan valid for 30 days. These plans give a definite amount of high‑speed data that must be used within the specified validity period, which can be more cost‑effective for most travelers unless they require very high data consumption beyond the available caps.