My broker doesn't show fee on some of the Vanguard instruments, but e.g. the S&P 500 UCITS ETF (USD) has 0.08 % listed as fee. Which ones are you looking at?

VWRA (all world UCITS) probably the more famous one charging 0.22%, while the closest corresponding US ETF VT (total world) is just 0.06% (dropped from 0.07%)

How does AUM compare between the two?

FTSE All-World UCITS ETF (VWRP) has 0.22%

Vanguard FTSE Europe ETF (VGK) is only 0.06%

How do those compare to average expense ratios and fees in that market?