I used to work at a major real estate company and I know very well how intent they are on holding the listing service monopoly together. Redfin, Zillow, etc were all bets on the opening of the listing services that misunderstood the regulatory capture of the National, State and Local Realtor associations. They ended up selling ads to Realtors rather than opening up a new way for owners to sell their homes directly.
That's true of most work. Software engineering is much less work/effort than a minimum wage job. The higher you go, the easier it is.
Shutting the project down gracefully doesn't mean it has to end, and it doesn't mean failure: shutting down the project gives invested community members the chance to fork it and demonstrate that they want to put the work in to run a natural successor to your project, and people will naturally gravitate towards the best fork over time. Afterall, without people with a vision leading it, it's just code.
Handing over ownership feels cleanest but it's rarely the best outcome (unless you're handing it over to a natural successor).