Regarding IAP. There has been bug fixes for the Google Billing Library in v3.0.1 (released 2020-09-30) and also in v3.0.3 (released 2021-03-12) which both could affect cordova builds afaik.
Sure, all software libraries regularly update, and we periodically update the versions we use too. Minor updates like this tend to just be routine maintenance and so not something we have to rush updates out for. IAP also uses cordova-plugin-purchase internally, and we're up-to-date with the latest version of that (v10.5.0). It's not easy to update further than that Cordova plugin supports, but it's regularly maintained and it looks like they're already working on an update with Google Billing Library v3.0.3, so it will get updated in the end. This is all pretty normal for a software library.
Regarding consent SDK (part of Mobile Advert plugin) there has been a lot of changes here
I'm aware of that, but as I mentioned these changes are really difficult and time consuming to incorporate. It's on the todo list.
Regarding Admob SDK (also part of the Mobile Advert plugin) Google has made a lot of changes for the different ads, most of which was released in v19.2-19.7.
We actually already use v19.8.0, which only came out last month. I'm aware there's a v20 with lots of breaking changes - again it's difficult and time consuming to make all the changes necessary for this update, but it's on the todo list.
In short, I'd like to point out that just because a new revision is out, e.g. 1.0.1 while we're still using 1.0.0, is not a sign of some kind of negligence about updating. It just means some regular maintenance has happened, and users of the library will update in due course.