The vast majority (97% ?) of voters are low-information voters. 1 such vote is equal to 1 high information vote (3% ?), those who research, read bills, etc.
So the process is already not maximally equitable - in fact, the system severely punishes high information voters via opportunity cost.
At that point dollars positively affect your outcome because with paid mediums , low information voters can now get more information, despite being unwilling to inform themselves via hard work. So that's a benefit. That information flow is subject to competition, so the best ideas (and information) will win out. That's another plus. Money competes for eyeballs, and your dollars are just as good as mine. If you have more $$, i can pool my friends and beat you. There's nothing more equitable than that we have discovered so far.
Now, enter someone with a ton of money, Musk. You could argue that he would tilt the game. But we then observe the opposite: Billionaires are also subject to the law of diminishing returns. 'Donations' will only buy so much favor, and then they become a losing proposition. So, do you want a billionaire burning his cash in the political process? The answer is absolutely: it signals a level of credibility and conviction, when business opportunity is already a loser.
So in short, you want people to risk all their chips in something they believe, instead of limiting their bets and just get rich off the house, playing the long game .
Perhaps we start from the other side of the table. Maybe money is not the problem. Perhaps it is the power concentrated in too few individuals ? How about cutting off power from those that are selling favors to the highest bidders ?