That’s called free market capitalism.
A boycott is usually based on moral objections to a company, not financial. Obviously Sony has interest in making money — increasing prices of a video game subscription is not morally objectionable. Choosing to not purchase a product based on its market value vs perceived value is basic supply and demand.
If you were to not purchase a PS Plus subscription based on employee wages, or environmental impact of manufacturing, or something like that, then that would be a boycott. Objection to price is capitalism.
Not trying to argue that Sony is right to increase prices like that, just calling it what it is.
Why wait? Linux has never been better. I have tried to daily drive various distros for the better part of a decade and have just recently (about a year ago) settled in Arch and have never looked back.