Nothing has stopped Microstrategy buying bitcoins, they are buying bitcoins regularly.
Yes, Nothing stopped MicroStrategy's buying bitcoins, they regularly bought bitcoins over time. Maybe their Bitcoin buying trend will continue in the future. Yesterday when Michael Saylor said they needed the green dot, Peter Schiff, the stupidest Bitcoin critic ever, made a post about him, maybe he did it as a mockery.

Today they purchased 15,350 bitcoins worth $1.5 billion.
They have bought Bitcoin for six weeks in a row, even after Bitcoin hit a new all-time high last night they bought $1.5 billion worth of Bitcoin today. They are going to hit a milestone by consistently buying bitcoins over time. At the moment MicroStrategy needs only 61 thousand bitcoins to touch the 0.5 million bitcoin. Maybe they will reach this milestone in the next few weeks or a Month.
Thanks @pk, I made a mistake which I have corrected now. Chad Saylor is doing the Chad move by front-running the United States government. If the governments from the different regions of the world actually start accumulating Bitcoin as a "reserve", Chad Saylor's "gamble" will be written in trading and investment books as one of the greatest risk-taking moments in history. Perhaps something like John D. Rockefeller with his massive oil pipelines bet or Cornelius Vanderbilt's risk on the rail road system.