What a posting service does
A posting service publishes posts and comments on Reddit for you, often priced per post. If you have already planned what to say and just need hands to do it, that is what a posting service is for. The thinnest versions are just volume.
What Reddit SEO adds
Reddit SEO is strategic. It targets the threads that already rank or get cited for your category, writes to earn engagement, and measures whether Google and AI tools start surfacing your brand. Posting is one small part of it, and on its own it rarely ranks or gets cited.
The risk of posting alone
Volume without strategy is exactly what Reddit punishes. A cheap posting service that floods threads with promotional comments can get your brand downvoted or banned, which costs far more than it saved.
Which one do you need?
If you want durable visibility in search and AI answers, you need Reddit SEO, not just posting. If you genuinely only need publishing hands, a posting service can work, as long as it uses branded accounts and follows the rules. The homepage here explains the SEO approach, and Upvote Labs does it end to end.