By optional I meant that you can use the service with or without paying. (Example: donating to Patreon or subbing on Twitch is optional; paying for Netflix isn'

By optional I meant that you can use the service with or without paying. (Example: donating to Patreon or subbing on Twitch is optional; paying for Netflix isn't optional since you have to pay in order to watch anything on Netflix). Obviously using any of them in the first place is optional too.