Every other shareholder gets access to the shares. So the effect is: you can buy $420 worth of twitter stock for $210 unless you're elon musk or working in conc

Every other shareholder gets access to the shares. So the effect is: you can buy $420 worth of twitter stock for $210 unless you're elon musk or working in concert with elon musk. Some poison pills just give the shareholder extra shares -- it's basically a stock split except for the targeted shareholders.