For numerous reasons, we are not able to keep the system free (high development costs and a desire to develop the system further and improve it). Let even with restrictions of the free tariff.
In this regard: from June 20, 2019, the free tariff is no longer. All current customers of the free tariff are transferred to the test period of the paid tariff and, if it does not suit them, then the account will be blocked after the test period expires.
You can test and understand whether you need a system with the help of a test period (14 days) of any of the paid tariffs.