I just made a discovery here. I can "hide" tags by immediately following a divider (---) with them, like this!
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#mastodon #formatting #hidden #secret #tags #taggingSystem #tagging #tag #anonymous #seo #search #fedi #fediverse #community #infosec #information #featured #fyp #fedihelp #joinin #discussion #linux #windows #ios #macos #markdown #text #aesthetic #blog #technology #tech #oc #writingCommunity #writing #help #advice #computing #writersCoffeeClub #security #cyberSecurity #android