You are so active these days! 

Thanks for the quick input

I don't think so.

MicroStrategy doesn't hold bitcoins of other people like ETFs so in case of a hard fork, they don't vote for other people which chain they are going to follow.

Holding more coins does not give someone more control over the network.

They will own lot of BTC, not 51% of miners. Talking about (de)centralization does not make sense.

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Will there come a point in time in which MicroStrategy holds so much BTC that its decentralisation is compromised?