They marketed the living heck out of it. For a while I couldn't turn around without seeing a Monday.com ad.
Looks like it's been paying off for them, but I prefer to support smaller startups, especially when all I need it for is roadmapping.
The Timelinr landing page could also do with a lot of work but I think it's mostly the tone of voice that doesn't work well with me personally.
It reaffirmed something an old colleague of mine said: everyone in startup tech assumes you're politically on the left. And those ads were aimed at those people.