I get it! The Obisidan community is very privacy focused. Based on your comment I'm surprised you trust having your data on the Roam servers. FWIW Outliner and most plugins are 100% open source so you can see inspect the code, e.g. https://github.com/vslinko/obsidian-outliner
Don't hesitate to send questions. We also have an active Discord where I hang out. https://obsidian.md/community