Of the 3 subscription bootstrappers listed in this thread, lemmony is by far the worst of them because it subscribes to EVERYTHING by default.
Lcs forces you to pick a number of communities to subscribe to, and the other one has default threshold heuristics that pick a limited number of active communities. Lemmony signs you up for the entire firehose of the threadiverse which both makes instances using it pretty bad fediverse citizens in terms of generating a 50x-100x the federation load of a "normal" single-user instance that subs maybe a hundred communities... and also exposes novice single-user instance owners to legal liability by subbing all the small under-moderated communities full of questionably illegal stuff.
I would recommend one of the better designed tools, and to review the resulting subscription list manually to ensure you're not signing up for some sketchy stuff.