Any product/feature developed by Facebook which will give them full control should not be used by publishers or content creators.One fine day they change the algorithm or a policy and your are your own. E.g Zynga story or the Indian media sites losing millions of page views overnight . it would be interesting if the successor 'Instant articles' is used heavily.I follow a lot of news publishers on FB , In my news feed I haven't seen much of instant articles .