In all seriousness, all apps and frontends should to implement countermeasures (if they haven't already) so that you can turn off image previews as needed
It basically takes your IP address, looks up an estimated town based on some free geoip database you can download, and renders that as text inside an image.
There have been tools to generate little images like this that people have been sticking inline in forum posts for decades. Literal decades. The world has not yet caught fire because of that, either.
If you're old enough, you'll remember seeing oodles of people's forum signatures containing a smiley face holding up a sign containing something like this: