If you are using their services for something important you should pay for it. I use fastmail not gmail for this reason: email is too important for me to risk on an account I don't pay for. I don't pay for youtube, because I don't care if they go out of business. I probably would pay for facebook if possible (but only if they make it FACEbook - not political memes, offensive jokes, and cat pictures) as it is a good way to keep in touch with distant friends.