Can anyone point me to the primary infrastructural vulnerabilities of the ethereum blockchain?

I recall arguments about centralization of validators, about necessity of AWS in many cases, and some tcpip element upon which the entire infrastructure depends (need deets there). 

Check my profile and you might be able to see why I'm asking... Can't share more unfortunately. 

@calle 👁️⚡👁️ 

 It's the pedoboy, Vitalik. He's the the primary vulnerability.