Huh?
How could this even have been a thread... let alone two? It's social media. If you don't like it, then unfollow.
Just like you wouldn't open a Boden catalogue if you didn't really like Boden. You wouldn't come on AIBU and complain about being done at looking at a Boden catalogue with the perfect families and children inside them, etc.
I have blogger friends (yes, one of them is a mommy blogger, but not in the UK). It's just a bloody job. They don't really deserve the vitriol of people who can't handle their 'perfect lives'.
If it's all about transparency... well, Instagram is about pictures. They're not really reviewing things, most of the time, they just go "Me in my xxx outfit". Now, when I watch movies, I might see Scarlett Johannson in an outfit that I like. But I still decide myself whether I will go out there and buy it or not.
Similarly, when you look at Instagram, you can decide to buy whatever they are wearing. Surely, you buy it because YOU like it. Why would it make a difference if they were paid for wearing it or got it given for free? It would be terribly creepy if you're only buying an item because you thought the Instagrammer bought it herself!