The fact alone that they were used isn't enough to be suspicious.

Most of Dominion's business is has to be legitimate in order to maintain a "legitimate" front. If they rigged every election they participated in, they'd get caught and end up going out of business.

This isn't a vote-rigging for hire operation, it's a "legitimate business" that the stakeholders (US political figures) have built for their own use when the time comes i.e. to save their own asses in an election. And there's no way those stakeholders care enough about Scheer vs Bernier (LOL) to the expose themselves and potentially lose the capability. They would save that for when they needed for their own lection, not blow it on some meaningless party leadership race in another country.