If a spam is defined as the o.p. not interacting then yes that’d be a spam, but most people are here for the picture or the information, it shouldn’t be a debate that reddit’s content is more or less the only thing making them superior to Lemmy, the userbase comes afterwards. That’d be an undeniable improvement, we wouldn’t “lose” anything anymore by coming over to Lemmy.
And thanks for the advice, i subscribed to TIL, that was exactly what i was looking for, but there’s not a lot of subreddits(, edit : on the contrary, there’s a lot of them, more visible on a computer, but if you’re reading this comment and are interested, as a reminder you may have forgotten that you can still subscribe to communities belonging to instances your own instance has defederated with, it fortunately has zero impact, only on the local feed).

So, that’s legal apparently.