People and processes are what I love about startups. I've worked in Government, a startup when it was 50 people all the way to 200 and a successful exit. After the exit, joined a much larger org with 1,000s of employees. Now I'm part of another startup I co-founded and got funded.
In my experience, larger organizations and government tend to have too many processes that distract from meaningful work and progress. People feel detached from the success of the company, I mean how much influence can you have as one person amoung thousands? It seems to lead to lower motivation and more tribalism.
Startups are personal, you know everyone, you can make an impact and when things go well you share in the success.