Are there founders who didn‘t appear to work on one particular thing really long and then had a breakthrough, but were more tinkering with a lot of ideas for a while until something clicked?

Founder /kiwi-news, a decentralized Hacker News

The Angry Birds people made a lot of games that were not very popular until they made Angry Birds which blew up.

Also Slack ppl were working on one product (can’t even remember what it was) and decided to scrap it completely  and focus on their side project (internal chat system).

yeah I remember Slack actually, they did like a browser online game or something