Figma is a web app. Web apps are fundamentally a hyper-competitive market because literally anyone can just throw something up on the internet if they think there is a need for it. The risk here of Adobe overcharging for it is rather low - someone would build a cheap clone.
People keep coming up with theories that companies are about to corner the market then over-charge, but the theories vastly outnumber the cases where it ever happens in practice. 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 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.