You can read the blog post that way if you want and insinuate the most negative possible interpretation, but I'm just going through why I choose not to do that.
For one thing, I'm failing to see how this supposed "walled garden" is going to magically materialize and benefit them financially. The best answer I get from all the alarmed people surrounding this subject is that they'll want to charge monthly fees for premium features in the software, especially to print farm owners.
But they don't operate in a competitive vacuum and that would instantly shift users to their competition. Print farm users pay off their equipment very quickly. I've seen cost breakdowns done by actual print farm operators online and the initial and ongoing machine cost is essentially the smallest part of the cost of doing business. Print farmers would pretty much switch away to other brands instantly if Bambu started charging fees for print farm scale.
If they charge even a Netflix-like fee of someting like $20/month, that essentially pays for a $1000 Prusa printer minus the cost of a Bambu printer in only 3 years. They have no room to charge monthly fees against comptetition.