Well, there are many things to consider here. First off, let me say I really appreciate your “battle” for open science: I think that’s what we should fight for, and I totally support that (I’m a PhD in computer science, but done with research). I don’t think that the fact that you don’t use FOSS makes your battle for open science any less legitimate, that is still super valid and you shouldn’t feel hypocrite. That said, it is true that Apple does not support or contribute to open source at all (I believe CUPS is one of the few open source things Apple did, correct me if I’m wrong here).
Nonetheless, I totally understand the coziness of having such an integrated environment between all your devices: this is not gonna happen on Linux, or at least not at that level. I do believe that the Linux desktop experience has become much more user friendly (imo much more than Windows for instance), and there are also cool integration options such as KDE connect, but that’s probably not as good and cool as Apple integration.
Committing to open source can be a time-consuming decision, and most people that advocates for FOSS still use or give their data to non-FOSS software (such as Google, Facebook etc.). So, my advice would be to embrace as much as you want of the open philosophy: you’re already “fighting” for open science, maybe you can start using some open source software (maybe your email client? your pdf reader?). Little by little you’ll judge by yourself what and how much you want to commit to the FOSS philosophy :)
I’ve been seeing a lot of posts about Threads privacy policy lately, where people seem genuinely shocked about it. I think it’s good to raise awareness about how much data you’re selling to Facebook company if you choose to use Threads, but I think it’s also good to remind people (as the article does) that this happens also when you use Instagram or Facebook itself. Ditch Meta