Questions over shoreline access and public versus private jurisdiction have bubbled to the surface in a controversy that pits a wealthy blockchain entrepreneur against many who frequent popular swimming spot Cliff House in Kapalua. Maui shoreline activist Kai Nishiki via social media Wednesday alerted residents that neighboring mansion-owner Jonathan Yantis allegedly cut down the Cliff House ladder, erected misleading nature preserve signs about native birds and hired a private security officer to “harass” people about noise, drinking and music.