There are many fair points in the comments here.

Let me be clear: I love WordPress and Elementor.

From my point of view, I think the wording in the Elementor’s ad could probably be improved to make it sound more like a teamwork between the CMS and the page builder. But, Elementor also has to sell its product. Business is business.

Now, WordPress works fine without Elementor.
We all know that we can build a great website only with Gutenberg, even if it takes more time and effort, of course, but it’s possible and there’s room for improvement.
But we can all agree on the fact that it’s quicker with Elementor and in a user friendly manner. So that makes Elementor a great addition to WordPress.

Also, if you want to use Elementor, you must use WordPress too so it’s not like Elementor is ‘stealing’ WordPress users.
So, yes, if there are so many Elementor users, that’s definitely because they find their happiness with it and not with WordPress alone (yet?).

We can either see the WordPress + Elementor as a great team to build awesome websites and make users happy, or we can waste our time complaining that there are solutions being developed and improved by others for users.

Now, with regards to the ‘‘don’t bite the hand that feeds you.’’, that’s a fair point too.
I don’t think Elementor should be banned at all and let’s keep in mind that WordPress and Elementor need each other to work (or maybe Elementor needs WordPress rather than the other way round).
Unless Elementor plans on building their own CMS, I agree on the fact that it’s not a question of accepting criticism here but more one of not biting the hand that feeds you.