Not at all.
For example, in the Apple ecosystem I enjoy having up to 10 iOS devices on my AppleID or in my associated “family” sharing the same app, at the same time. As I upgrade or replace any device, that device gets those apps for free, as well as any updates for free. I also enjoy a new iOS every year and numerous firmware updates during the year that add functionality that did not exist previously.
For example, I get the Apple iWork suite FREE that now supports collaborative work, and that is a big deal. Naturally iWork both imports and exports files into the MS Office Suite nearly flawlessly. Numbers (Excel), Pages (Word), and Keynote (PowerPoint). All free.
So, is that a ecosystem? Yes it is.
Now let’s add to it. I can make phone calls or FaceTime phone calls from my Mac, iPad or iPhone. Using either my Ethernet WiFi or phone number, seamlessly. I can move files between these devices using AirDrop by simply clicking on the file and telling the device which device I wish it “AirDropped” too. I can relay video from any device to any other device. That is nice. That is the Apple “environment” that is supported across all Apple devices, so that would be a “ecosystem”
“As I upgrade or replace any device, that device gets those apps for free, as well as any updates for free. I also enjoy a new iOS every year and numerous firmware updates during the year that add functionality that did not exist previously.”
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Meh, you can get a free OS with free programs and updates to both the OS and apps anytime without joining some iBorg. Get Linux, it won’t cost you a thing other for the device(s) of your own choosing that you want to put it on.