Some do, some don’t. Bunching them all together is like saying All Quilters only hand stitch.
I use a lot of batiks. If I’m using lights along with very dark, saturated colors I check- especially reds, purples, deep blues to see if they are going to bleed. If they do I prewash, if they pass the test I don’t. I usually toss a color catcher in when I launder my finishe ( batik containing) quilt just to be safe. I’ve seldom had a problem. Some shop owners seem to group {hand dyes and batiks} into the same group....they are quite different and hand dyes tend to contain a lot of excess dye ( are just rinsed out after dyeing) batiks are boiled to remove the wax- not that common to have them still full of excess dye.