Isn't it time to step down and let someone competent control the donated funds?
Who would that be, and how much should they be paid

I wouldn't be able to name a candidate for this.
With the kind of money we are talking about (over 1,000 btc), you could hire any auditor like Deloitte and Touché, for maybe a single bitcoin a year.
That's basically like an accountant, right? They're not supposed to be in charge of operations.
I don't think handing over decision making to a large corporation would make the forum any better.
within a couple years this would be a modern Web3 forum
That sounds just like another buzz-word mostly used by DeFi-scams. I'd leave this forum if it turns into some dynamic moving site where algorithms decide what I get to read.