Not sure why the only reason you would make an account simply to post for this company. When as some stated they either read or 1st hand experience regarding the structure of the company.
To call people liars when anyone can clearly read the terms + conditions on the very bottom of their page is a bit concerning. Per their own writing
"You will pay a monthly membership fee or an annual membership fee. The price of that monthly or annual membership may be anywhere from $9.99 to $99.99 but will always be listed clearly at the time you pay for the membership. Other pricing variations are possible so users should refer back to the actual amount they agreed to when signing up and providing payment. Observati reserves the right to change this price at any time for any reason."
Additionally "The Shopper Program is not a job and should not be considered a form of employment. You will not be earning an income that would allow you to support yourself.
For those of us who have done IC work for many years, its very clear the structure of this company isnt like any others. No one makes you pay them as you are a valuable asset in a sense for them. We all have/currently work with dozens. So yes it is a bit odd when a "new" company is categorizing their self with others yet setup being different. (And I say new because although they have all these review images they post, ratings. I personally never heard of them up until about a year ago.)
To add on, google search is anyones friend, if you look them up you quickly will also see real reviews where people are stating their experience with them and how they have been scammed. Many who submit the reviews, never get paid and when trying to contact anyone from the company no response is ever returned.