Many companies are happy to pay for IntelliJ, Docker, and GitHub. I think it depends on which tools you choose to build.
IntelliJ and Docker give most of their products away for free. Why? Probably mostly because there is no good solution to licensing local software. They rely on the patronage of a relative few corporations, who have legal departments that will enforce the licensing rules on their behalf to avoid legal risk. Unfortunately that means that their business is an enterprise licensing business which is difficult to break into. Success in enterprise licensing is less about product quality and more about sales. That's not the kind of business I'd like to be in.
I know I have an active subscription still for PyCharm, even though I've not used it personally since moving to vim full-time a couple of years ago. It's a great product, and I find it extremely useful when teaching people new to Python - the autocomplete is excellent, and there are visualization tools that I've not found a good replacement for.
First, they charge different prices for an "individual" licenses vs. an "organizational" licenses. Why? Because businesses have larger checkbooks.
PyCharm: there's a free Community version and a paid Professional version. Python is the most common beginner teaching language, so give the basic stuff away for free. Once you get into "pro" stuff -- sci stuff, web dev, DB stuff -- that's when there's a budget and so people are willing to pay.
WebStorm: Javascript is a mess of an ecosystem and there's tons of free tools out there so no point in JetBrains giving away a free version. However, once you value your productivity and want something that Just Works out of the box with reasonable defaults, that's when a webstorm license becomes something you pay for. Besides, every startup does some form of web dev these days, so larger market.
IntelliJ: Java used to be the go-to language for learning object-oriented coding, so like python, offer a free community edition. Once you dive into Spring stuff, well, you're going there because you have a boss and the boss has budget.