There are several options for skip tracing to find phone numbers and email addresses.

Any recommendations for free tools to do market research?

Happy to chat with you

The mortgage company gets paid off first, then in a traditional sale, the rest minus agent fees and utilities and closing costs goes to the seller.

I wasn't aware of this until my lender ended up showing me all of these different options from a lender's view.

It's a fairly unregulated space (charging grandma $750 to puts around for 3 hours, after moving the old box from the horizontal sensor, which was the only problem with the garage door to begin with), so some combination of carefully reading reviews (you have to actually read them to make sure it's not 200 fake reviews), and maybe not giving them the full contract all at once, is in order. 

They offer SFRs across the country (1031 eligible) that are fully triple net lease - meaning there's no costs to the homeowner, no vacancy liability, no unexpected repairs and maintenance, NOTHING.

Based on a quick answer from Perplexity it seems like there would be no issue with you buying the home and collecting passive income, but you may not be allowed to manage it yourself since that is considered active work.

Happy to send recs in my DM

I think this is what is going on.