Constant messages about upgrading, discounts, last chances... can drive a beginner mad on this site. They clearly have only one goal in mind... make money. I was a regular member and once they started the "pro" accounts, photography comes in second place. I'm still a free member but not willing to upgrade because of this point of view.
Update juli 2022,
The amount of annoying pushing messages is pretty low right now. I admit I only use youpic not as often anymore but I think this improved a lot. (I only have a free account)