Even worse for non-American stockholders of American companies - the IRS charges a 30% foreign withholding tax on dividends. If you ban stock buybacks in favour of dividends, it’s a big tax increase on foreigners, so US stocks lose a whole pile of value for American stockholders when foreigners dump American equities until the ROI equalizes. (Roughly 20% of US equities are foreign-owned.)

They’ll funnel it through a US based shell company. C’mon now.

Sure, but there are still market impacts from e.g. banning buybacks and foreigners dumping AAPL to funnel their funds via BRK.