I haven't found a good, recent comparison online, so I have checked a bit more. All infos for the free versions. Main disadvantages (there might be more)
XWiki: Now registration works, but import costs 5000 EUR. The free version could be just a demo and the TOS might be strict
editthis: no pics (anymore) , but could use links (needs another hoster)
slimwiki: no export
Miraheze: needs manual request. they may delete it after 60 days inactive
Shoutwiki: (uses mediawiki) import max 2MB and needs manual request, currently don't work at all. For 1 year no registration possible. They had data loss issues. Usually, wiki creation possible even without mail.
Wikidot: 300 MB. Obviously very strict TOS. They may delete when inactive, no import, currently export don't work
doowikis: unknown company and features. no real wiki but single, untiteld pages. Hosting, but unknown if pics will be hosted there.
ourproject: (mediawiki): 10 MB via web (in total ?) , certificate error. import ~1000 pages (?), seems abandoned
fandom/wikia: if I remember correctly no import(?) I now read about import and/or export but unknown if it works and how much, too much ads, probably too strict tos, wiki owner don't own their data
Nuclino: 50 documents
Zenkit: 500 documents. German host with strict laws
notion: 5 MB (total ?) input of 1000 "blocks" (text, pic = 1 block each), 5 guests
PBworks: 50 MB, educational: 2 GB, import only for paid business version (not educational) , may delete when inactive
confluence: 2 GB. only selected company members can read wiki, probably strict TOS
wiki-site: I use (old mediawiki 1.11) Old TLS 1.1 which not works by default on recent Firefox and will be
removed. No SSL, need to enter captchas, Google can't find content
wix.com: Domain not free after 1 year. Maybe other restictions (import ?)
Conclusion: There's no good wiki farm. Even when not need import (copy/paste). Even for small space. Main problem are strict TOS of commercial wikis. Alternative: Self hosting and manual setup. Complicated and needs a good hoster with same problems. (I found hosters with unlimited free space. But read about many cases where accounts were closed for no reason and users should pay for premium service.)
Blogs: I haven't found better blogs than Blogger. Similar problem (strict TOS). Google has some disadvantages and bugs, and recently limited web space and availabilty.
https://biboverallsfilms.blogspot.com/2021/06/info-issues-with-my-wiki-comparison.html
I now made a new blog here on blogger.