Can you please elaborate more on the topic? The click rate is also reduced, it is very difficult to get approved, and it is very difficult to optimize as well, any referral traffic wouldn't work so you have only option is SEO.
hi because there is hung peoples are joining adsense in these days so google make more restrict and more difficult if you have good site with good traffic then no issue at all you can easily get account and make money from adsense and be-care full to do SEO now as google algorithm changes in penguine just make quality back links and don't target 1 keyword at all if you do then google must spam your site
Simple reason - Too many people trying to screw Google (trying to make a quick buck my using all means necessary).
Yes, seo is your best bet, and unfortunately seo is becoming harder and harder..so in turn Adsense is becoming harder and harder. You just need to market the hell out of your site on social media and start building momentum (viral traffic) to your site. Affiliate marketing is a safer bet though.