Piracy: ꜱᴀɪʟ ᴛʜᴇ ʜɪɢʜ ꜱᴇᴀꜱ

So i was installing a repack on my linux system, using bottles because of its flatpak sandbox.

As the install was wrapping, it asked the standard question about redirecting the websites, I (probably thinking nothing will happen) didn't uncheck anything, and to my surprise, it opened the Firefox browser on my main system and launched the website: giving me quite the spook

doesn't this mean that anything i install on bottles can somehow still ping home even if I disable networking from Flatseal?

am I being paranoid or is this a serious security flaw?