For some older, more obscure titles, yeah. Usually, not at all. Few times i had to ask one of the admins/maintainers of such websites to check for a certain release for me and, thankfully, in more cases that not they've managed to find what I was looking for.
EDIT: I can't remember which one I had trouble finding the files for but maybe it was some specific updates for the 60 Seconds! Reatomized and maybe a Little Briar Rose (the point -and-click adventure game made by the same studio that made Children of Silentown, really good not-so-horror point-and-click adventure game, totally recommended). Maybe it was Darkestville Castle as well, but yeah, can't really remember. I know that it took me a few days to find it. But, really, all of these titles are less popular on the Switch compared to the other platforms.