Worth it in what way? Are you already self hosting and looking to just offload some of your critical services to a VPS for its availability, or are you fairly new to all of this?
For your first question on the VPS, I’d suggest thinking about backups (Is it provided by your VPS? Do you need something like Backblaze B2?) and firewalls.
For your Cosmos question:
I’m curious to know if this means Cosmos will only manage DNS for services hosted on the same box.
No, not necessarily. The DNS zone you control lives on Cosmos, but the records themselves just point to IP addresses. You can point an A record to any reachable IP, whether it’s the same VPS or a completely different server. As long as the tunnel is alive, the backend can be anywhere.



Since this post is gaining some steam, I’ll drop a few links here for anyone who isn’t familiar with the Flock controversies.
Flock cameras show signals of being used for widespread surveillance by private organizations with really no accountability or restrictions on how/who they’re surveilling. Because of that, various legal challenges, civil rights objections, and other pushback is occurring around the US to fight back against the privacy violations and attempting to establish accountability for those operating these systems.