This incident was funny, people went to Revoke cash to secure themselves in case they were hacked, and doing so actually got them hacked. Good thing that dev took site offline as soon as he became aware of it, it saved many.
These are horrible large-scale attacks. The perpetrator knows that a particular Ledger library is being used widely across many sites, so I believe this is a carefully planned and executed attack.
This incident also shows what lacking in the altcoin/token spaces, specifically, things that mentioned themselves as "decentralized platform". A truly decentralized platform should not rely on single and centralized library CDNs. On another hand, this proves that security measure is lacking among many applications.
Even decentralized blockchains like ethereum are not really decentralized as most of nodes are hosted on centralized cloud providers [1].
[1]
https://cointelegraph.com/news/vitalik-buterin-ethereum-centralization-issues-running-nodes-easier