Bc EA's too busy shilling micro transactions to fix long-term issues
If you can't make a Spore account but still want to share things you've made, you can just share the preview images the game makes (under documents > my spore creations). The game stores the data for them in the images themselves!
Though if you do share the pics, make sure you're hosting it on a service that doesn't strip or change metadata! The embedded data's the key to making sharing this way work!
Examples of sites that strip metadata: Toyhouse, most social medias
Sites that shouldnt't strip metadata: Dropbox/other cloud storage sites, Discord edit only bc this got bumped recently: don't use discord, use a regular image host like Filegarden & postimage.
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Extra note: still pretty new to spore so I'm not sure how sharing adventures offline would work (based off an old/defunct solution i've found, you'll probably need to keep track of & bundle every custom asset you use & iirc some players found adventures saved this way don't generate as much XP.)
If you're an older player feel free to correct me or add on