The tone is all over the place here, this feels like it's an attack post disguised as not. If you're really grateful to this person, complaining they haven't done more to more fully handover seems pretty entitled. If you actually think they've been a bad leader and could have done better then say so. And, like, are you volunteering to actually step up and put the work in? Because "open up to community contributions" is not a magic wand and can easily end up costing more work than it saves; particularly if that community is unable or unwilling to provide $3000/month of funds, what makes you think that they'd suddenly step up if you asked for non-financial contributions instead?