> That shows the search algorithms ... are good enough and Google can be eventually disrupted

I doubt this. I'm guessing that 90% of Google Search's development effort is concentrated on defeating SEO, and as soon as a new competitor succeeds well enough to attract SEO attention, their results will suddenly turn to custard.

The competitor then has to combat the extremely sophisticated SEO practises developed against Google over the years. This is likely to be an even bigger barrier to disruption than building market share against Google.