I am most likely to see it in the world of STEM diversity initiatives, as a diverse person in STEM who cares about advocacy, I feel like it happens all the time. I won't call out specific examples but egads, it's like every day, someone wakes up and says "we should start a program to reach out to kids and expose them to engineering and science opportunities!" and they start from scratch, a brand new...
website, facebook page, committee meeting time, blog, program, lighting talks session, coffee meetup, board of directors, grant proposal committee, team building retreat, brainstorming session, logo design, tshirt sales, mugs, pens, manifesto, mission statement, badge lanyard.
It's even better when their "newness" and "inspired initiative" gets them noticed by some other powerful CEO or government person and suddenly there's a executive sponsor too.
All this before they've actually done anything.
And the whole time, they could have just volunteered a few hours with an existing organization.
I had a breakdown about it a long time ago on a political campaign too. Back when I was a better gay rights activist, I can't tell you how many times I'd talk to people who'd say "Oh I totally agree with you on this issue, I just never feel like I hear anyone else saying it, the other side is so organized and we are not."
One day in a sunday school class I yelled, "You can't say we're not organized if you've never attended a single meeting of THE ORGANIZATION that is right in front of you!"
Maybe these established groups need help. They need leadership, the existing board is burnt out, they could use a new activity idea, they could use fresh connections.
Those are all reasons to join! Not start a new group.
And yes, you will have to attend some meetings and LISTEN and learn the old way first because maybe they won't take kindly to you "I'm the 23 year old who knows everything and is here to save you!" introduction at the first meeting. But you might learn some things by listening to. Maybe that thing that didn't work before is worth trying again, maybe it's not. You won't know unless you actually hear what they're saying.
So join a group.
Join an old engineering society... IEEE, SAE, AIAA, SWE, NSBE.
Want to share ideas? Join Toastmasters, it's like a mini-TED conference every week going on everywhere, without the "you have to be a millionaire" feeling of TED.
Join the rotary club. Join the optimist club. Join a church. Be old-fashioned.
Put your energy into harnessing people who are already there - they'll save you some recruiting work. You'll learn something.
IT'LL BE GOOD FOR YOU.
Maybe you can't say you started the group, but you'll meet some amazing people who will all love and appreciate what you've done and see you as a leader, and that's huge.
And maybe you'll learn that your different idea is really different and needs a new group. That's okay too. The bright spots in those old organizations you joined might help you even - people will be behind you, since they know you, they'll vouch for you, it'll be even bigger.
Stop reinventing wheels and try being a joiner. Just try it. What do you have to lose?