Commercial decks, where the deck maintainer is paid for his efforts, make a lot of sense.
And I suppose if they are making money out of the ecosystem, it also only makes sense that commercial deck makers make a contribution to the technology that makes it possible. I suppose I would prefer that be a contribution rather than ownership and custody, but I suppose Anki's license terms (it is AGPL3+ - I think without a CLA) prevents them closing it.
So cautiously optimistic
Writing the cards is engaging with the cards for some small subset of the population. I am part of that audience. But most people are terrible at it, and it's not an easy skill to build.
Ther majority of people who are interested in Anki -- and the vast majority of normal human beings with nonzero willingness to pay, which is a very unique subset of the population with goals that tend to look like "Pass X exam by Y date so I can [get a job|earn my citizenship in a better country|...] -- just want good pedagogical material wrapped in some control harness so they can treat some fraction of their learning the same way they treat going to the gym. Show up, put in the reps, get results.
[1]: https://til.andrew-quinn.me/posts/the-second-wave-of-spaced-...