If that is true, then it is equally true of the authors of shells.
But of course, it's not true. Many great and lasting tools have been founded out of corporate work in a bid to improve mindshare and ease recruiting by increasing the esteem of corporate engineering efforts. Many of the things we think of as "open source" and "free" were built subsidized either directly or indirectly by capitalistic interest.
But I'm not concerned about keeping it. Ossifying my process so that I can give myself the luxury of time of from learning is not something I'm prepared to do, because I think it will make me soft and less capable as an engineer. I regularly rotate my editors and learn new languages because I don't want to become like the sad specters of the previous generation of software engineers I see now, starched shirts and ties and a fanatical devotion to the dated technologies they stomach in order to collect huge consulting fees from corporations.
I've switched off Fish to Powershell as my primary shell for awhile. It's interesting.