@Justiciar: I do know my own tendency to "pricklyness" - what a neat word! - but had tried to limit it to people not reading what I actually wrote. I have learned to tolerate people disagreeing... };-) especially after asking myself...
As for "products" being available: I am fully aware of several, PocketFMS not the least - but they all remain products indeed. I revolt at the idea of having to pay for information that is _BY_LAW_ and _BY_NATURE_ freely available. And indeed what I have set up as yet is just a simple but usable graphical representation of data I collected, mostly from the AIP's, or from other sources who themselves consulted the AIP's.
Commercial sources carry my continued distrust - money gone is a certainty, the quality of supplied data remains to be seen. Hence my curiosity about liability/warranty. The lack of response is not really surprising me.
DAFIF I came to distrust, probably undeserved, through its advertising the wrong tower frequency for my (then) home airfield for several years. And it is discontinued, anyway.
The effort required to keep up the database would be big, but could be largely automated. Keeping users' data up to date would surely be their own responsability - the project can only endeavour to keep its database to the best possible standards, and offer a tool for users to synchronise with it.
@Windriver: thanks for your constructive reply. Yes I do know the matter of solution vs. problem. No I do believe I avoid this pitfall, I am trying to set up some free software and free data sources - "free" meaning both free of cost and free of copyright or other limitations - to do as many useful things as possible through the same hardware, to limit both cost and complexity and power consumption and panel occupation.
One "subproject" that would have to be done anyway is to create a European superset of aerodrome information, going beyond the AIP information (such as availability of fuel, restaurant, taxi, overnight hangarage). Several countries have comprehensive systems, but I find a European consolidation sadly missing. A multi-lingual consultation interface should be the least trouble... Again, such a database could be automatically updated from the various national contributors.