I work for a company building real estate adjacent software and have worked on connections to all the major property management systems and large (and small) proptech companies. I can tell you that at least 90% of them have some of the worst security practices you've ever seen. Many of the largest property management systems allow a third-party vendor to export your Social Security number and date of birth, and most property managers I've seen don't bat an eye at giving up as much information as their vendor requests (which they usually don't need).

Real estate is very much a closed of group of more traditional business and has not begun to understand their responsibility to keep this data safe.

Edit for more detail: To tack onto this, it's very much the case we're all familiar with where management doesn't care about something being built correctly, they just want it built. Add on top that the management usually has no technical background. Also add that very few engineers that are passionate about writing good software want to stick around at these companies. It's a real nightmare industry.

There are some companies that will give you faith, but they're the occasional large property manager that's been scared shitless about a security based lawsuit (fine by me) or a proptech that's "disrupting" the industry that will be acquired by one of the big dogs in 18 months and slowly eroded away.