I’m a little late to the party. However, I have a few comments to add if anyone is interested 
Registering a legal organization in The Netherlands is a piece of cake at least. Easiest option would be to start a foundation. It only costs you a one-time fee at a notary if you keep the statutes fairly simple. Things do get a bit more complicated if you want to generate large profits and/or hire people. Otherwise, there are quite some options to have something low key and a bit more reliable than donating to a private person.
My remaining comments are more or less off-topic. Excuse me if this gets out of hand 
There are plenty of brands that make it into our language as verbs. Is it unhealthy that ‘googling’ is a word? There were plenty of other search engines around before Google, but once something is done right, and becomes popular, things logically tend to stick. The corresponding market share is (mostly) rightly earned imo.
I don’t know why ‘coreldrawing’ or ‘corel photopainting’ hasn’t picked up or ‘paintshoppro-ing’… Unfortunately, ‘gimping’ doesn’t sound right.
First, isn’t any tool as good as its users? Second, like @paperdigits also argues, what determines ‘the best’ is very subjective and also a very fluid concept. I never liked working with Photoshop and always preferred how Jasc (not so much Corel!) PaintShop Pro worked. I used to never like the way GIMP worked, but I have grown accustomed to it. Do I think of any of these as ‘the best’ raster image editor? Not really. Do I think that Photoshop and PaintShop Pro are too expensive for my (very amateur) needs? Most certainly yes. Consider your goal, then choose the right tool.
This is highly debatable. Finding an attractive unique selling point is often much more effective to lose your competition. That USP could be making your software free, while the competition is still expensive (DaVinci Resolve), or producing relevant search results fast (Google vs. Yahoo/Altavista/…). There are probably countless examples more.
I actually think trying to outdo your competition by trying to replace it, in terms or sheer amount of functionality done ‘better’ or somehow having a greater ease of use, is futile. Be unique, play to your strengths and adapt to user’s needs. A great example of this is imo darktable which has seen quite a revolution in recent times. The developers are actively listening and interacting with their users, and simultaneously getting more unique because of the filmic processing, working more in linear RGB space and whatnot. Is that called becoming/being ‘better’? I doubt it. Will darktable dominate the market for raw processing because of this? Likely not with the mainstream popularity of Lightroom. Is it gaining in popularity, though? I think so. Will RawTherapee see a decline in its userbase because of this? Maybe (or maybe RT needs to evolve as well in some way).
I was just trying to be polite to OpenOffice. I’ve been using LibreOffice on both Linux and Windows ever since the events that caused LibreOffice to come into existence.