Remember we're talking about zero or near-zero resource types here, as in the person doing this after coming home from a day job. Anything big enough to call itself a publisher is already bigger than a typical hobbyist and might be trying to have that gig become the day job, at which point yes it's a business and at the same time isn't much of a hobby any more.
A hobbyist can take as long as desired to produce something, even if the end intent is that it go on the market and maybe make a buck or two, and can always harmlessly bail on the project if it doesn't work out. A business can as well, provided the business funds the project itself and doesn't rely on anyone else.
Once you go with a crowd-fund, however, you've given yourself fairly hard deadlines due to the promises you've made (assuming a good-faith intent on keeping those promises). And, bailing on a failed project becomes a much more fraught and complicated process.
So now it's become work, rather than a hobby; never mind deadlines can and do cause loss of quality if-when time gets tight.