I may read it the wrong way, but basically it says "since all (98.4%) our customers have more than 2 Gb of RAM, then Microsoft should only make 64 bit OS".
So, how many of Microsoft's customers are also customers of Backblaze?
Like 0.1%?
As a side note, the even point for the need to go 64 bit (bigger OS, bigger executables, more memory used, etc.) is not in my experience at the 4 Gb of RAM level, but rather at the 6 Gb.