I thnk those in the class action suit are going to find it difficult to prove their case because so many apps and websites are interlinked via 'cookies' that it is very easy to get targeted adverts. For me, Amazon is the worst one, it does not matter what website I visit, if it has ad potential I will get an email from Amazon advertising that they are selling that product in their store. I was looking at footwear from Sports direct, few hours later I get an email from Amazon about sports footwear. I visited an online toy store to look for toys for my niece and nephew birthday, few hours later I get an email from Amazon about the specific toys I looked at which they happen to have in their store. I visited Creative Labs website to see what computer audio stuff they had, yes you guessed it, a few hours later I get an email from Amazon telling me what Creative labs items they have in their store.
If you look at the 'cookies' that get hidden inside your browser, you will see a list of 'Associated partners' and other 'partners' and advertisers who are associated with the company that the 'cookie' is assigned to. I read the online news at Yahoo and at the time, a box came up asking me to accept or deny the cookie settings. I checked the list of companies that was linked to Yahoo that would be requesting my information and browser activity, at the time there was over 400 companies listed and each one i had to tick a box that said do i give permission for them to have my information, i ticked NO. This is only one example but it happens to every website.
People think Google is bad with it's persistant collection of peoples information, people do not realise just how bad Amazon is. Every website that has a popup that requests me to accept the 'cookie' has Amazon as one of it's prime 'Associated partners' meaning you are not able to disble it's tracking (i check each and everytime).
Instagram, WhatsApp, Snapchat, Twitter, Facebook, WeChat and many others, they all have Amazon as prime 'Associated partner' which means if your talking about something that Amazon just so happens to have in it's store, BAM you will get a targeted ad. This is why I think it is going to be very hard to prove that Apple is the cause of the directed ads.