Beginning with the disclosure that while posting this I am wearing their sig.

I think that there are many reasons for why they are doing what they are doing in the way they are doing it.
Most have been stated in this thread more or less:

Quote from: webtricks on November 01, 2019, 06:03:30 PM

May be I am completely wrong but this is what I assume the main reason behind the astonishing campaigning from Yobit merely for a forum: Yobit conducts IEO (ICO) once or so every month. Currently Yobit intimates users about these through email. But to increase the success of these ICOs, YoBit needs higher community participation. Due to bad reputation on Bitcointalk, it is hard for YoBit to announce IEOs on Bitcointalk. Hence they developed Cryptotalk as an asset to increase participation in coin funding and to catalyst their pump/dump operations.

And

Quote from: webtricks on November 01, 2019, 08:43:05 PM

When you have over 300K posts on your forum in a month, Google surely gonna crawl many of those and list these on Google Search. When you have organic crypto-oriented traffic coming to your site, even putting a broad header with 0.5% click-through rate can give you handsome number of investors.

"If you got big money, think of the bigger picture" - Yobit

And

Quote from: LoyceV on November 01, 2019, 11:54:14 AM

I can only think of website rankings: according to worthofweb.com, their value more than doubled in less than a month. I don't think it's working much though, it's now worth 5 times more than worthofweb.com/loyce.club, while I didn't even try Tongue

Along with a few other rankings (Alexa, and such) the higher you get the more you can demand for ads.

Quote from: asche on November 01, 2019, 06:02:14 PM

Since the topic here shifted to why they are doing what they are, I am going to give my opinion about this.
It's a fucking trolling contest.
Both campaigns, the one managed here by yahoo, and their local campaign are just 2 middlefingers raised in bitcointalk's face.

This is some kind of twisted revenge for bitcointalk's banning of the YoBit campaign.

Possibly a tiny bit, but if you have 1000s and 1000s of BTC I can see them spending a bit.

And I am sure there are others.

What is also an interesting question is how deep their marketing and other data goes.
Do they know what BTC came in and what BTC went out and how much BTC was made due to people clicking on links in the sig.

That would be interesting to know.

-Dave