hot take i know but the rush of being a billionaire fades quick. and to just remove particle accel would be unfair now.
perhaps we just add a new skin that you can only get if you turn in all your money, and then we also remove particle accel. so people have a chance to spend it if they want and then when that rush fades they can reset.
that way moving forward we can add content without it being like split the playerbase between particle accel and none.
but perhaps the dev doesn't view this as a problem so nw. i just think player retention will be a little better with a healthy grind and showing off expensive items actually means something going forward.