WRT Patreon, I'm 99% sure that this is the reason they didn't propose something like a "balance card" where patrons just give them $X and both pledges and fees get deducted from that -- since that money's being held and then paid to someone else, it could end up being too close to a "money transmission service." (I'd thought there was a non-zero chance that this was a motivating factor in this change to start with, actually; coming so soon after a huge investment round sure makes it seem like there was a condition to that investment that spurred this change. Christie Koehler wrote a good post about that on her blog, although I don't have the link handy.)
How is that different from putting money into a Patreon account, which can later be allocated to content creators, at which point the funds are disbursed, minus Patreon's rake?
Patreon could certainly do that, but either they haven't considered it or--probably more likely--they don't like the idea. There could be practical reasons for not wanting to do that; a lot of people have talked about Patreon's problems with chargebacks, for instance, when people want to cancel pledges but they're bundled together with pledges they want to keep going all in one credit card transaction. In this balance card scenario, it'd be easy to have someone say, "Hey, I wanna cancel the monthly pledges I'm giving and get my balance back," and they could lose a lot of goodwill if they say, "Yeah, you can't do that." (While many of us would rather receive cash than gift cards, we generally understand that an iTunes gift card is something we can only use by spending at iTunes.)
(Edited to add: of course, this means that Patreon could have done a balance card thing if they were willing to say "but you can't get your balance back if you cancel," but I doubt that would have won much more love than the per-transaction fee idea did...)