The organization becomes a parasite that exists only to perpetuate itself. Hiring and spending expand to fill all available space which becomes its own justification to increase fundraising further. If any actual work for the public good gets done that's just a side benefit.
If WMF had simply held spending constant (adjusting for inflation) for just a few years they could have had an endowment big enough to ensure Wikipedia is able to run independently forever. If they were being responsible they'd also have spun it into a subsidiary non-profit that owned Wikipedia along with that endowment with a charter to focus exclusively on running Wikipedia and developing the software. Then their octopus of random spending programs could be operated as a sister subsidiary without any risk of destroying Wikipedia itself.
Honestly at this point if they proposed that plan I'd be willing to donate to get it done. Instead they hold Wikipedia hostage to justify their expanding empire.