I follow some people elsewhere who are mostly hyping up kbin because the main developer of Lemmy is a tankie and the main developer of kbin maybe isn’t - but it’s such a weird thing to apply a purity test to. Other comments mentioned it but Lemmy is FOSS
Actually Kbin is FLOSS too: https://github.com/ernestwisniewski/kbin
At least you should be able to export/import your subscription list.