If social media start banning accounts because they recognize certain memes, there are ways we may be able to foil this.
Software generally uses a hash function (a special kind of cryptographic sum) to recognize that an image is the same as another image.
To change the hash of an image: you just need to cause one byte (or more) in the file to change. And that is easy. A skilled memer can change the image in a way that no one can recognize visually.
But anybody can do it. It's not difficult at all.
Open the image in your art program.
(MS Paint, Inkscape, gimp, photoshop, etc.)
Any of the following changes will make it a completely different image, from the standpoint of software that compares images by comparing their hash function.
Change a pixel
Resize / scale / crop
Add text or marking
Blur
Sharpen
Change color: contrast, grayscale, saturation, lightness
Save the image in a different format: .jpg, .png, .gif
etc.
If it comes to that, we can make a tool (using ImageMagick command line) to batch-process existing images into "new" images.