I think the Germans just nationalized Gazprom’s holdings in Germany, including the pipelines, so the Russians actually have the most incentive to sabotage them.
Speculation.
And everyone has ‘speculation.’
“If Russia were to cut pipelines in the Baltic Sea it would damage those that bring Norwegian gas to Europe, not the pipelines it owns and which give it some leverage.
Russia thus surely has no plausible interest in sabotaging the Nord Stream system. Others though do have such interests.”
‘The War On Germany Just Entered Its Hot Phase’
https://www.moonofalabama.org/2022/09/the-war-on-germany-just-entered-its-hot-phase.html#more