Astrophotography without a telescope

Something I’m wondering about if it’s possible: getting some of the pleasure of amateur astrophotography without a telescope. Just start with raw image data captured from someone else and posted online, then do all the processing yourself. Sure it’s not as fun as making the exposure yourself, particularly the sense that somehow you didn’t acquire the image yourself. But my impression looking at astrophotos is that the real artistry and creativity is in the image processing anyway. Also maybe it makes sense to start with the software, since that’s much less of an investment than the telescope and mount and imaging system. If I don’t find hours of processing an image until it’s just right fun, it’s unlikely I’ll find it fun first spending hours and $$$$s acquiring an image, then more hours processing it until it’s just right.