There was actually almost exactly this debate brought to Mastodon by entomologists posting about their scientific research, much of which involved the public education of people who by-and-large live in a society where insects (and wider "bugs") are seen purely as disgusting pests - and they wished to discuss the beautiful creatures they were studying in light of the need to normalize this common part of our ecosystem
They were, of course, largely chased off Mastodon, or science instances were added to mute lists, because there were a lot of people who felt their particular phobic triggers should take cultural precidence and indeed that it should be normalized to hide insects (a category of life currently undergoing a mass-extinction event all aorund us) instead of showing them to the public.
I am a clinically recovered arcahnaphobe, so I don't exactly have an even-handed say in this mess. But my short version of it is: This is a bad idea, a bad practice, and indeed users tag muffling their personal triggers is what the cultural norm should be. CW'ing a common form of life that is necessary and integral to basically every thriving above-water ecosystem on the planet is not great! And spiders are part of that too!