I'm excited about the concept, because it has the elements of something great. But I'm skeptical about the "sharing economy" approach of renting out time on home chargers. Like others have mentioned, the real problem is affordable, available chargers at the user's residence, rather than trying to make more chargers available in residential neighborhoods.
But the other problem that EV users have, especially users that aren't simple there-and-back commuters, is that they need predictable and dependable charging while away from home.
I own an EV myself, and I can't tell you how many times I've made a trip somewhere during the day, expecting to have a charger available, only to find that they're all taken when I arrive. This is somewhat alleviated by networked chargers, where you can see whether they're available beforehand, but there's been many occasions where the charger is snagged by someone else while I'm driving there. Because of this I'm extremely cautious about driving too far in a given day, and in fact, end up using a regular gasoline car if I know I have to drive beyond the range of my EV, since it's too hard to tell if and when I'll be able to charge along the way.
So where your concept comes in is the ability to reserve chargers. That means I can actually plan my day, plan a road trip, etc. And ideally the chargers will be in the same places I actually want to go - along freeways, in shopping centers, downtown, etc (i.e. not far off in residential areas).
I could definitely see this as a service that could plug into existing networks (e.g. EVGo, Blink, Chargepoint, etc), although getting them all to play nice together is difficult. But I would heartily applaud someone who could organize and simplify EV charging away from home and make it dependable and predictable. Good luck!