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MVMT Watches, Boll & Branch, Casper, so many DTCs. Yes at some point word of mouth kicks in!

Wayfair - you can listen to the NPR podcast "How I built this" where they talk about building their entire business around domain names and pay-per-click advertising (7 billion market cap).

Here's one I worked on when I was at CogoLabs: https://venturefizz.com/deals/autotegrity-acquired-adp

This wouldn't be too uncommon in branded ecommerce. If you are selling well known brands it is going to be very hard to get decent organic search rankings for them in the short term.