When it comes to altcoin projects, Bitcointalk is a great place to advertise those especially if the company has plans to run ICO and similar advertising campaigns.
I beg to disagree, bitcointalk is the last place where you want to advertise your altcoin project. I mean, back in the day when altcoins didn't have many option, advertising here was a must I guess. Hell, back in the day even Vitalik created ANN here to promote Ethereum, which I can't imagine any of the new popular altcoins like Polkadot or Link would do now. I don't go much into altcoin section anymore, but from what I could see, huge majority of altcoin projects that come here to advertise are worst possible shitcoins not even capable of entering top 200-300.
Then again, it's no surprise that altcoins are avoiding bitcointalk. First, because vast majority of them are indeed worthless shitcoins and will be called out/tagged if there is anything wrong with them, and usually there is something to be found. 2nd, this is bitcoin forum after all so people here consider all altcoins as shitcoins (except maybe Monero and a few others) so why come here in the first place?
You are absolutely right here bitcointalk will be last option for shitcoins to come here and announce their shitty projects. Reason is very simple.. it's a forum not a twitter or facebook where you can pay to get likes and retweets... I believe we still have healthy and very capable members which can expose such scammers within minutes. This is the major reason they won't touch bitcointalk, otherwise this is still best place for genuine, real and meaningful projects.
I remember coinmarketcap use to have a dedicated link for bitcointalk.org which is now under community and mixed with reddit and twitter etc links.