Google is well and truly the dominant player in Australia's online advertising market.

According to research firm IBISWorld, Google has more than 40 per cent share of the $9.7 billion industry.

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Mr Harrison says the potential loss of Google search would cause supply disruptions for small businesses, as well as job losses in sectors such as hospitality, tourism and the trades.

Reviews would need to be rebuilt and advertising and SEO optimisation would have to be rebought, which he says could be problematic for some businesses as they've invested heavily in optimising for Google.

Maybe basing your whole business around having good SEO wasn’t a great long term strategy??