As a rule, each paid channel has a free version, in which signals are selectively served so that you can check their accuracy. It is quite possible that you will be satisfied with these free signals for your trading and will be able to do without the paid version. But in any case, you should know that there are no paid channels in which all signals work out at 100%.
You are correct and it is Very important that before joining in any paid signal provider channel, we can check their result for their free signal, it is important becouse for this everyone can understand that really their signal is working or not and also i see a person who provide free signal through his free signal group and if somebody satisfied with his Free signal then they can join his paid Group.