I've spent a couple of hours looking at the advert placements today. There are some new adverts and some have been removed. I've spent a decent amount of time testing the adverts on both mobile and desktop sites and they both seem reasonable to me.
I have removed a significant number of ads from the mobile site but as a compromise these have been replaced with a bottom slider ad which can be removed and some occasional full page ads.
Previously the slider ads were placed at the top of the page which interfered with the Option Tabs. The new slider ads are at the base of the forum and can be removed by pressing the \/ the image thumbnail shows an arrow where the ads can be clicked/touched to remove them.
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Full page ads will appear periodically and they can easily be removed by clicking/touching the top right corner denoted by an [X] or [CLOSE] tab this is indicated by an arrow in the thumbnail.
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I have maximised the number of advertisements Google AdSense will allow me to removed so it has been a balancing act to get the right ones removed to ensure the best user experience we can achieve. I hope everyone who doesn't pay a subscription can understand that this is essential to maintain the forums viability.