The blog post regarding this “dump” suggests that it was actually from malware, so the answer to “Does that mean malware was once on your system?” is likely to be Yes. https://www.troyhunt.com/processing-23-billion-rows-of-alien-txtbase-stealer-logs/

Use the ‘Notify me’ option and verify your email address, and then it will show the expanded list of domains that were exposed from the malware:

Thread is over, because this is the only correct answer.

No worries. Gramps (desktop) is where I do work on my main tree, and then personally I will do a one-way sync (so that it can’t “corrupt” my tree) up to my GrampsWeb docker frontend so that the rest of my family can view the data.

I don’t understand what you mean by “official docker container” because Gramps is desktop software and doesn’t have a container. The GrampsWeb / Gramps.js is the web interface for browsing it, that can run in a Docker container, but is developed separately.

You can use the Gramps desktop app on your normal computer and then host a frontend using Gramps.js