I agree with most concerns here but as a professional prototypist... people do not seem to understand here and on related issues what "reference implementation" means.
This is NOT supposed to be used! By anybody! This is basically a technical demonstration that shows how it can be done at all.
Think of this as a test suite rather than software proper.
Again, this does not mean it's OK to even suggest that Google and Apple are in any way acceptable bottleneck. I do believe those are terrible choices. I do also believe relying on them just to do a proof of concept or technical demonstration is quite "lazy" but I also bet that this was necessary due to the scope of the project, e.g. "deliver us an app that works in 6 months on an average mobile phone". I really don't think they had discussion on accessibility, inclusion, etc.
So... yes, do keep track and be concerned but also don't conflate a proof of concept with a maintained app that will be required to be used on all EU citizen mobile phones next year.