It's highly reasonable for them to limit image size/quality to whatever looks fine to 98% of their readers. They store and serve an absolute ton of ever-changing content to browsers/apps; The very small (and likely revenue-negative) contingent of highly motivated people can find the originals if the images are especially noteworthy like these.
Now imagine that adversaries maintain and monitor profiles on known military personnel with leaky online accounts such as these, supplemented with intelligence about their rank, unit, specializations, and so forth - correlating all of these pings together with known and unknown vessels, and across land. They can learn a lot more than "a big ship is there", without even necessarily having access to recent satellite imagery or other hardware.
I can't recall if the PS2 was cheaper than available DVD players when it launched, but I do distinctly remember it being true of the PS3 and Blu-ray for some time given how new it was then
PS2 was cheaper at announce time, but by launch there were units priced 'competitively' (not always with PS2's capabilities such as ability to do component out, but almost always with a better UX).
I should note the 'other' option that came up back then at college was just tossing a DVD Drive in a computer that they had or had purchased; by that point a majority/plurality of new/recent desktops had enough horsepower to do it, though drives were still fairly expensive...
It's obviously not something you'd want to happen _passively_ when visiting a web page, but if the alternative is installing an executable / using a package manager / etc., why not? At least the browser is a more secure sandboxed environment for running untrusted code than most peoples' native OS.
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