Maybe something got lost in translation (I'm not a native speaker) but a startup cannot be small?
Crucially, the startup might not be like a business in some important regards. It's common to operate a startup at a significant financial loss, with the goal of either being bought out or growing fast enough to "make it up in volume" before the VC money runs out.
(sidenote: the word "startup" is also coming to sometimes be used to mean a self-funded tech-oriented business, without VC backing, with a slower expected growth rate but an expectation of maxing out at significant revenues).
All of this is in contrast to "small businesses", which have relatively modest growth prospects (sub-$1m is very common), frequently keep a headcount low enough to gather all employees in a small room, and are designed with prompt profitability in mind from the start, due to taking little/no outside investment.
Startups, both by their mode of operation and their level of ambition, rapidly grow to hundreds or thousands of employees, and demand immense revenue/funding to cover that. Small businesses are designed to get off the ground efficiently and more or less coast, sometimes with limited growth over time, sometimes keeping a steadystate.
Anyway, about the comment I should start a small business instead of a startup, yeah I don't plan to grow to millions of users and having hundreds of employees.
In both cases I've been investing my time and blood in exchange for money. Then the money runs out and you start all over again, and again. I want to invest my time into something which hopefully can grow so that I can keep investing more of my time instead of just giving it away. I want to plant a forest that will produce on its own instead of having to plant and harvest again on each season.
Freedom is another important aspect. I've been frustrated during my professional career with clients and bosses making the wrong decisions again and again and living with the consequences of those decisions.
I might totally fail while building what I'm building (see my profile) but that's better than waking up one day and realizing I've wasted my life. Thankfully I'm in a position where I can invest a couple of years of my life without earning money and I don't have people depending on me.