I wouldn't consider that free. You are paying for a service.
You are free to provide this suggestion here for everyone to consider but I don't think it is worthy for inclusion in the OP.
Others are of course free to give their opinions.
What is that you pay then ? of course its free!! as in you get paid in bitcoins for reading ??
by that logic, whenever you pay for a service, the service provider is getting FREE money!
Advertisers are paying for all the services mentioned above so by your logic it isn't free.
It probably comes down to questions such as:
Are they doing something they enjoy doing?
Are they performing a service for you or another?
Are they doing something they would do themselves if they weren't being given bitcoins?
Different people may have different opinions. Myself I don't think FeedZeBirds qualifies either since they are asking for one to perform the service
of retweeting advertising. Some may find that is so easy, and maybe even fun and/or fulfilling, that getting bitcoin for that service is as good as free,
but another may find it a waste of time and may not like sending, what they consider spam, to all their followers. They may even end up losing
some followers because of it.
Hey does anyone want to come over and help me build an addition on to my home? I will give you "free" bitcoins if you do.
