One year of massive redundancy costs (tens of) millions of dollars, and will always be slightly susceptible to failure anyway.
[0] - https://www.macrotrends.net/stocks/charts/RDDT/reddit/revenu...
$5,219,178 per day
$214,765 per hour
$3,580 per minute
Maybe the real question is how does someone that size keep it up so reliably?
You also have to consider which mission is it critical to?