I wonder where this graph gets it's data from. Scala sitting at 4.6 percent and python at 1.2 percent is not what I would expect, but my perception of the industry could be totally off.
They've apparently written their own web crawler that attempts to infer what language is used based on a bunch of, unspecified, heuristics. I wonder if at least some of the problem is that it is very easy to see if site uses PHP and much harder to see if a site uses a python backend and a such most python using sites just aren't being counted.
I totally believe the graph, if only for things like WordPress, and a number of other infrastructure-level tools.
I know that the porn industry is still big on PHP. There was a post here, some time ago, that linked to a PornHub programmer, talking about their IT stack, and it was all PHP.
It's a boring workhorse. The "boring" part is attractive to IT pros.
Maybe because most websites are Wordpress websites.
Those sites get a lot of traffic.
I did notice that JavaScript (which may include TypeScript) is going up, but so is Java, and that Java is still higher than JavaScript.