and I quote you:

My favourite Band for example. They only use Instagram and Facebook. It’s infuriating. I just log in via browser every few months.

How many others feel the same way? At the next concert you say, they’ve got another page, on an open source network, come check it out. You say you’re a big fan, so why support them? Never failed, never tried.

All networks start small. What happens upon seeding is we often find, increasingly interesting overlaps, someone, somewhere different, or someone different finds it. Because it’s an open network, not a gate kept network, or at least more open. Over the long run, the fediverse will increase in population, and popularity, overtaking networks whose primary purpose is advertising and data collection. So yes, start small, try and see what happens. This is his we build sustainable networks, for the people, by the people.

Is their one app, for pixelfed, Lemmy and mastadon, that respects your privacy? Or is 3 separate apps better?

Make a page for them, auto paste their content, then tell them they have a following on pixelfed, and hand them the account.