That is not what would happen. Figma has built a huge moat through its brand by now, and most customers would continue to use it; some of them probably already have an Adobe subscription anyway, so Adobe would naturally try to make it easier or more integrated for these customers.

A clone would need to start from scratch and compete against a huge corporation with virtually unlimited funds.

> It is almost always that the biggest companies in the market are just more competitive (lower prices or higher quality) than all the others.

That is almost always not what is happening. The big players extinguish any would-be competition early by buying them or throwing sticks into their wheels. They can afford to strategically make a loss in a given area to underbid the competition by overcharging in others, or relying on synergies. There are numerous examples where small teams built highly qualitative alternatives to corpo stuff, but had to compete against the network effects and brand names instead.