Your question is very strange, you want to know: " Who or what is pumping Bitcoin "
and then you ask this:
What are their motives:
To pump and dump.
Or
Pump and get the price of BTC and investors confidence up. In this instance I would hope the intentions are good!
all options do not seem to match bitcoin reality, so I do not understand your question and why the hell are you asking these questions?
I do not think that bitcoin prices can be pumped. This is simply due to the demand of the market affecting the price of bitcoin only
I agree