If people are cutting Barclays slack, perhaps it's because the guy on Twitter is painting this as a satanically evil deed when it was probably just someone making a stupid mistake.

Additionally, the aggregate bandwidth cost of delivering that JS file during its lifetime is probably less than $0.05. How many copies of this file would need to be concatenated to equal the size of David After Dentist?

No one levels up on the Internet — and especially Twitter — by being calm and reasonable.

I looked at the Tweet (you know, it's also the article title) and it does no such thing - even referring to this as the Internet Archive CDN.

This is entirely a strawman you are burning down to make light of the fact that far from a stupid mistake, this is recklessness enabled by the joke of an "web development" industry. This stupidity is common practice and certainly no one in this thread seems even slightly inclined to clean it up.

You can do any stupid things in any development environment. Let's execute a SQL from Android App to Oracle in Bank!

Loading JavaScript from an external website is not "just someone making a stupid mistake".

It means they don't have their security in order, they're a bunch of amateurs and their banking license should be revoked.

Barclays was just borrowing some resources from Internet Archive. What's the big deal?

Anyone with write access to the file can run their code on the bank's website.