First: Thank you mrkgnao that you helped the community here so long even after your quitting the forum (which I still do regret immensely). All your help is and was greatly appreciated and of course we all (myself included) do respect your decision since it's only yours to make.
However I have some thoughts: By reporting those updates to MaGog you were always helping the GOG community and not GOG itself (as far as I understand) so would this choice really affect GOG itself or rather the community? To rephrase this: will GOG get fewer customers just because not all updates are reported? I highly doubt this. GOG is promoting Galaxy as we all know and since their update flags never really worked and they also left the completely broken notification system this way for weeks now (with no ETA when this even might be fixed) I would say that they could not care less. However the community still does. So imo this will only lead to the fact that community members will not realize that several games have updated therefore their archives won't be up to date any more. No problem for Galaxy users here. As I said - GOG could not care less as long those customers won't quit the platform completely which I doubt will happen. Of course these are pure subjective speculations on my side (based on my own feelings and thoughts) and I might be completely wrong here.
To answer you (and others), here are my thoughts:
1) I agree that one of the major functions of MaGog is to detect updates to offline installers. Which is why MaGog will continue doing that as before
. The only difference is that she will be doing it only for games added to GOG before 24/5/17. Anybody, like me, who does not plan to buy any games added to GOG on or after 24/5/17 will not be affected by the mode change in any way.
2) But MaGog is not only an alternative notification system. It is also an online search engine. And past statistics show that the search engine is being used much more during large GOG sales. On regular days, MaGog gets about 100 hits a day; during large sales, the number jumps up to more than 300 hits a day. Which leads me to believe that people use it to make purchase decisions. Again, pre-24/5/17 games will continue to contain up to date information, but newer games will be missing, making buying new ones ever so slightly less convenient.
3) One of the major domains that uses MaGog regularly is gog.com. This means that GOG employees seem to use MaGog as an alternative search engine for their own games more or less on a daily basis. The mode change will likely affect them too, as MaGog will no longer be "complete".
4) I don't delude myself that this change will have any noticeable effect on GOG's bottom line. But perhaps it might cause one person to rethink their relationship with GOG and perhaps it might cause one person not to buy one post-24/5/17 game from GOG. Which is enough of a "symbolic rebellion" for me.