While I agree that some of the things you describe are incredibly cruel, gossip and bitching aren’t the same as hate speech.
I’m not on Instagram, so not totally clued up on the ‘influencer’ world (although it’s a bit of a cringey word, isn’t it?). I’ve also never heard of Tattle besides on mumsnet, but from what I understand it’s completely separate to instagram, and so Mrs Hinch (or anyone else) only sees what’s written if they actively seek it out?
Harassment, bullying and abuse are absolutely wrong, and sending a person any kind of abuse isn’t ok. But I’m not sure that actively searching out bad things people have said about you counts.
For example if my neighbour calls me names, criticises my appearance etc, over the garden fence every time I go outside, that’s absolutely harassment. If she shares those views with her husband, in their own living room and i press a glass to the wall to listen, my feelings being hurt is really my responsibility.
I wonder where you would draw the line at what is legal? Public forums would be illegal, but what about face to face gossip? If those who’d shared their thoughts on tattle had been sitting round a table in a coffee shop, would that be ok? And is it only famous people, or would it extend to joe public too? Two of my colleagues yesterday were criticising the parenting methods of a mutual acquaintance of theirs. Some of what they said was very uncomplimentary, would I have been able to report them?
You’re asking to legislate people’s right to have an opinion, and that’s just not possible.