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How would you implement ads on steem? Since steem is decentralized it would be hard to pick ads and who would do it? Maybe witnesses, maybe people. There need to be a lot of changes made to steem to support this function!

Every advertiser can make a post about their offer and promote their post.....

Ohh ye, how did I not think about that! But still though, I doubt many people look at the promoted section much.

If they invest good amount on their post , it will land in trending page, which may give them maximum exposure...

Indont think it would be ads bit more like how bloggers promote with their content via reviews tutorials and testimonials. The ICO companis will need crypto saavy people with a crypto interested audience to help.pro.ote their projects.

You can still get your ICO on google if it is in article form via an influential blog or media outlet.

Thinning out the options for scammers and bad planners.

I wouldn't implement ads on Steem. I am an influencer and companies will come to me to help promote them.