MicroStrategy Inc (NASDAQ:MSTR) recently spent more than $800 million buying an additional 12,000 Bitcoin (CRYPTO: BTC). Monday on CNBC’s “Squawk Box,” Executive Chair Michael Saylor explained why MicroStrategy is so bullish on bitcoin. What To Know: MicroStrategy announced a new $800 million convertible senior notes offering this week and then used the net proceeds to buy bitcoin. In a new regulatory filing, MicroStrategy said it now holds approximately 205,000 bitcoin. Bitcoin is up more than 70% since the start of the year. The rally has largely been driven by increased demand following the…