Did they though? Looking at the gas futures chart it's not obvious to me at all. The prices suddenly spiked much higher when NS1 was suddenly shutdown. After the explosion they actually went down slightly. They did profit, but just from the actions from the Russian side (which were earlier in time).
As for whatever you mean with competitor coming online. Towards Germany the flows from Norway didn't change that much after the invasion, Europipe II from Norway to Germany was already maxed out since January 2021 pretty much.