Some people were manipulated by CA & psy-ops
(it does sound like techniques developed maybe for military / intelligence originally )
On a landslide vote, CA Brexitgate wouldn't be enough to matter, but it very probably swung a 52:48 voe
Probably including some usual non-voters whose anger CA cleverly directed into action
Others had their nationalism and fear / distrust of foreigners whipped up to overcome any concern about their jobs & pay, or the prospects of younger family members
Problem is: even when there has been fraud in an election, UK or US, only any individual politicians charged / convicted would be penalised
The result won't be over-turned unless this removes the majority in Parliament / Congress
and in the case of POTUS, even if Trump is removed from office, the Veep takes over (same party)
then iirc the Speaker of the House ? - only a party change if it happens after the Democrats have taken the House in the next elections (unlikely anyway)
Brexit won't be automatically overturned even if electoral fraud and criminal activity can be quickly proven, because there wasn't a "candidate," just an issue.
And as we keep saying, it was only advisory
However, the political decisions resulting from the referendum result can be over-turned with sufficient outrage & determination
CA manipulation is a clear moral outrage against UK democracy
Remainers can use this as a genuine reason to stand up against Brexit & its consequences;
It should be a moral rallying cry for Remainer MPs, those who have any backbone,
even gain support from those MPs who were not particularly strong Remainers.