It’s incredibly messy and time consuming.

For most, this isn't a realistic option so they update some of the most important regions themselves and copy the data from other providers where they don't have coverage.This is a big problem with these big consumer-grade real estate analytics platforms—you don't really know the source of that data, its frequency, etc.

Every great multifamily investor I’ve spoken with emphasizes this skill, and I see why.On the other hand, underwriting can be time-consuming and prone to human error.

With that being said, I personally know several people who've had tenants that stop paying their rent and try to hang around for as long as possible. 

I have experience building my own DTC consumer goods type sites so I was planning to build my own.

The data points to most markets have have a boom in housing supply (apartments, and SFH) giving the consumer choices to rent.

This negative equity position consumes the initial cash flow to re over the negative equity position.  

This creates an initial negative equity position that consumes the initial cash flow, sometimes for many years.

Consumer reports even has a report about how they're better than all the $300+ toilets.

This negative position can consume years of cash flow to recover.