I'd say we should engage with Reddit, but purely with the intention of getting people off of Reddit. If the working class is on Reddit more than Lemmy, then we need to agitate there and bring them to alternatives where reactionaries cannot control the narrative.
I do see the problems of developing an anti-imperialist movement in the belly of empire resulting in incoherent and reactionary opportunism, plus Reddit by nature prunes the leftists and keeps those that do more harm to the left than help, like the Gonzaloites.
Deeply reactionary and awful takes, combined with the Gonzaloites having domination over the Reddit subs related to Marxism, makes it pretty much unusable.
I can definitely see it ramping up even more than it already has. There may be one or two holdouts that distinguish themselves for not doing so, at least temporarily, though.
I do have the patience for Lemmy.ml and the libs from Lemmy.world, etc, but Reddit is a bit much...