why every single pin Is an ad ?

I've been using Pinterest for a good few years now and I noticed that for the last two weeks or so every single pin Is an ad , I would click in a pin in my homepage and out of 'related' 100 pins only 10 or so are pins actually related to the pin and all the others are ads !

It's extremely frustrating as it's make the app totally unusable . Is there a way to fix this because I'm 100% sure this must be a glitch !