Although i'm very new on the forum but based on what i have learnt on the forum, exchange signature campaign can bring about some possibility of a growing bubble in crypto market.
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Bubble? Definitely yes. Yobit has actually somehow indirectly started a bubble in forum There are dozens of topics about Yobit, and there are hundreds (or thousands) of posts about Yobit in Meta board, within last two days. It is a pay-per-post Bubble.
you have said exactly what was on my mind 
what I'm seeing is a bubble of spam/low quality posts advertising yobit exchange
in terms of price bubble, yobit doesn't have big enough trade volume to affect bitcoin market
and the fact that they trade almost all cryptos doesn't make yobit as a market influencer/mover