Unless you can run the LLM locally, on a computer you own, you are now completely dependent on a remote centralized system to do your work. Whoever controls that system can arbitrarily raise the prices, subtly manipulate the outputs, store and do anything they want with the inputs, or even suddenly cease to operate. And since, according to this article, only the latest and greatest LLM is acceptable (and I've seen that exact same argument six months ago), running locally is not viable (I've seen, in a recent discussion, someone mention a home server with something like 384G of RAM just to run one LLM locally).
To those of us who like Free Software because of the freedom it gives us, this is a severe regression.
See the Microsoft ecosystem as an example. Nothing they do could not be replicated, but the network effects they achieved are strong. Too much glue, and 3rd party systems, and also training, and what users are used to, and what workers you could hire are used to, now all point to the MS ecosystem.
In this early mass-AI-use phase you still can easily switch vendors, sure. Just like in the 1980s you could still choose some other OS or office suite (like Star Office - the basis for OpenOffice, Lotus, WordStar, WordPerfect) without paying that kind of ecosystem cost, because it did not exist yet.
Today too much infrastructure and software relies on the systems from one particular company to change easily, even if the competition were able to provide a better piece of software in one area.