For a positive reference I love how simple https://bird.makeup (a Twitter to Mastodon bridge) is; that's the UX that I wanted to replicate with Mastofeeder.
IMO Mastofeeder is as easy to abuse as any other Mastodon server (or spinning your own), so I wanted to make the service to be as easy for legitimate end users as possible.
And there's always technical measures to implement if I start seeing abuse: Throttling requests, limiting maximum feeds per users etc