Yes, to both statements.

However, duplicate submissions are starting to become shadowbanned (if the intent is to manipulate SERP), while having your site link on spammy sites is simply a downrank in relevant metrics.

The other corollary is that these sites will likely not have substantial enough metrics -- owing to the amount of outlinks they have to all sorts of low-ranked content -- and so posting your site on them for purely SEO purposes is misguided.

They're better used for organic traffic.