It is a certain thing that in the internet world, security is made a very high priority of all online security companies or bodies, and when it comes to cryptocurrency, or financial bodies the priority becomes even higher, but yet there's a room for breach, this is because the internet is not 100% secured.
ETH has been over the years in the crypto currency world, and as the years goes bye, so the advancement or upgrade of their system and a steady maintenance. This is because old hardware or security systems cannot stand modern day threats. This also goes with the PoS and the PoW.
With the new Blockchain out in the market today, some of them might be below standard and their trust levels in the industry.