PL7.5.0 exports "dark" JPGs because the user exported with a different export option

correct


The thing is, that not all apps are color managed OR are only partly color managed
and (some of) the topic has been covered here and here …

It’s not my intention to open that can of worms again. When the monitor is able to present colors in sRGB, best bet (the simplest) is to stay in that color space.