How did a rental startup I’d never heard of leak my home address?

I consider myself a fairly privacy-conscious person, going out of my way to evade online tracking and, for the most part, avoiding spam mail. But when I found myself staring at my home address on the website of a company I had never heard of, I knew somewhere I had gone wrong.
A few days before our rent was due at the end of April, my partner received an email from the owner of our apartment building about a new way we could pay rent while collecting reward points, like a loyalty program. It was a good offer at a time when rents are at record highs, so she clicked and it loaded the website of

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