ok buddy. I know it can be difficult to conceive when you're so insufferable that only like-minded folks wanna be around you but getting people and communities to migrate when everyone is already on a platform is quite more difficult than merely saying "let's all move to X app". I mean both of my main communities (both at around 10k members) tried to make a matrix bridge as a stepping stone towards hopefully migrating and neither succeeded because of 1) technical issues making bridges not quite well, 2) unwillingness to move from a communication platform with people and content to platform with no people and no content (after all, if you have to use Discord for all the other communities or whenever the bridge fucks up why would you not just use Discord at that point?) and 3) lacking infrastructure (not everyone can pay to self-host a community of 10k with a well-maintained bridge while also doing all the moderating).
My close friends and family use signal after I talked them into it so that ain't no issue for me but asking folks to use a specific platform just for 1 person is quite the ask for many and not everyone wants to be a lonely basement dweller that does nothing but complain about shit on Lemmy just because it refuses to use some objectively shit apps. There are people in the world who can be very good people and very good friends but happen to not be into all the privacy stuff, just like you may not be into stuff surrounding other very important rights. So yes, we still have to care about the apps we have to use