Subscriptions are difficult to avoid for certain situations where the developer does a lot of ongoing work and where the work is expected to continue in perpetuity without there being a set-in-stone finished product somewhere in the future.

But in all other cases, or even many of the ones where it is 'necessary', the presence of a subscription is a red flag for predatory pricing. Minor ongoing work or maintenance really doesn't cost as much as the author thinks it does. Keeping the lights on and updating API calls can be covered by new sales of permanent licenses as long as the app continues to sell. But if they had to go with a subscription, the real per-user cost would probably be measured in cents per month. Maybe add a bit more for their profit margin and charge a nice $1/mo. Do you see that anywhere except the rare app by a small developer that doesn't want to price gouge? No, all software businesses want at LEAST $5/10 a month because they've run the numbers and figured out all the tricks to human psychology, and they know they can trick someone into spending 'just $5' without them internalizing that the company is charging them a ridiculous $50-100 per user per year for even the most trivial service, leaving with almost pure profit. This is why investors love anything with a subscription service.

The author just inflates the prices and adds zeros to numbers to make permanent purchasing seem dead in the water, ignoring that we had multiple decades of software development before the advent of subscription services, where those prices were reserved for big professional suites and not your everyday app or a minor service. It's not that expensive, companies charging insane prices has just shifted your perception of what's going on behind the curtain. We even had one-time purchase mobile apps briefly, and they weren't doing it for charity either. Video games that don't require external services are still overwhelmingly priced for a single purchase, and somehow they're making bank despite also having to release updates and bugfixes.