Well, everything that says "Free" in a casino is not how the word or the concept of the word encompasses it, rather they will mean "free but with conditions" and these conditions greatly limit the majority of players when they say free they interpret it as a gift that the casino gives them and that it is also withdrawable, that is what the casinos do not understand, and by using those words they make many people upset and start the problems, just like with the bonuses, because I Personally, I have a very different concept of "bonus" from what is applied in casinos, which doesn't add up to me, but now at least I know how it is, those things I think are the ones that start conflicts.
The main issue is not the word
free but about the phrase
no-deposit.
Indeed to get the free spins, it is not required to deposit but in order to wager the winning from the free spins, deposit is required.
If you are familiar with such no deposit free spins, most other casinos will not ask users to deposit in order to wager the winning from the free spins.
Most casino lets players to complete the wagering requirement or to unlock the bonus balance with the winning from the free spins.