Why are the incentives for established nonprofits located in the US stacked such, that they fokus less on their core mission (Wikimedia, but also Mozilla come t

Why are the incentives for established nonprofits located in the US stacked such, that they fokus less on their core mission (Wikimedia, but also Mozilla come to mind) but seem to (ab)use the trust of the volunteers they should be serving and the donors by sinking money into strange projects and management boni...