Visa Card Network Crashes, Blockchain Has Never Gone Down

Your article states:

"Popular blockchains manning Bitcoin and Ethereum, two of the most frequently used cryptocurrencies boast a 100% downtime"

I don't think that is what you meant to say.

I also don't think you really want to include Ethereum in any discussion related to stability vis-à-vis the hardfork and all PoW blockchains are susceptible to 51% attacks.

https://thenextweb.com/hardfork/2018/05/30/heres-how-much-it...