No, they haven't been dyed.
They've just been breed so that the normal blue speckles of the wild ram's colouration has spread further and further out (like breeding a dalmation to have more spots
)
As with a lot of highly artificially bred varieties (pug dogs, for instance) they may be slightly more delicate and require a little more TLC than the near wild or wild sort.
For rams this means really warm (28°C/82°F), really clean (zero ammonia and nitrite and less than 40ppm nitrate at all times).
They may stay smaller than the normal coloured ram too, but no cruelty has been used to produce them and looked after there's no reason why they shouldn't have a perfectly normal, happy life.
If you like them and can met their needs, have them
They're not a hybrid fish either, just a special strain of
Mikrogeophagus ramirezi