Micro Strategy is chasing digital gold, they tried to buy as much as possible and continue to buy. Micro Strategy is buying more with the resources it has accumulated. Micro Strategy has started a good movement and it is good for all of us that Saylor's company bought bitcoin. It is based on using Bitcoin as a long-term store of value by adopting it as a treasury asset.
This approach has both increased the company's share price and become a pioneer model in institutional Bitcoin investments. It increases some people's concerns about decentralization, because of this strategy.
Right MicroStrategy led by Michael Saylor has unique plan. They want to buy and keep as much Bitcoin as they can. They believe Bitcoin is like digital gold and good way to save money for long time so they use it as main asset for their company. This plan has worked well for MicroStrategy making their company stock price go up much. They have also become leading example for other big companies thinking about investing in Bitcoin.
However not everyone agrees with this strategy like you said. Some people are worried that one company owning so much Bitcoin could be problem. They fear it might go against Bitcoin main idea of being controlled by many people not just few. But this is still not possible. We know Bitcoin has limited supply but it has very high value and distributed in many people.