I've noticed that the people losing their minds over Sync and solo software devs trying to make a living while keeping apps accessible, aren't the ones beating down the doors to contribute their time and skill and labor for open source. Most of them don't strike me as devs at all. I'm used to it. It's the lemmy equivalent of your one family member asking you to make them an app for free at a family Christmas.
People that are passionate about FOSS/FLOSS should definitely use those things. And support them financially. And contribute. But somehow the meta has become to dogpile on the first major third party app for our community that had a lot of users on reddit and which makes onboarding easy.
Personally I don't care. It's fine if you do. I think we spend too much energy squabbling over personal choices for very little results. We'd be much more effective if we focused on talking about and pressuring for regulation/policy changes instead of weighing each other down, especially when we are very like minded as a community.