Hello, I see lots of websites are using sticky ads from long time, I found some mixed up data on google that some expert says use it no problem some says its totally rescricted, if I put a sticky ad and keep my website user friendly, will that be a problem ? I want to put a sticky ads on my footer, after scrolling my 70 % of my page visitor will see my ads and the add will have a close button any one can close the ads if not interested. is this ok or I will completely avoid Sticky Ads ?

Thanks in advance.