that is a fair point. many of those I didn’t create, so I can’t speak to all of those, but I did create a couple and used one other.
- Microsoft Windows: I explained above, there’s a release which used the binary of a file (or something like that, not certain) for the album artwork. it’s credited to the file, and I figured that was the best way to enter that credit.
- Google Translate: I think you’re right that Kit probably ought to be a character, I’d been thinking the same thing, just haven’t put in the edits yet… Google Translate provides the vocals on tracks of Kitcaliber. I’d also seen this kind of relationship done before with other artists voiced by TTS engines. @RandomMushroom128 also mentioned on the Discord they’ve heard Google Translate as a voice on tracks
- Google Assistant: I added this entity because I’m almost certain that artists have used this voice like Google Translate above. I don’t know of any offhand tho… I added it so there’s a well-tagged, well-entered entity ahead of someone (possibly me) adding relationships to it. I may try and look for artists who use this voice in the next few days…
but we’re already getting a bit off the topic of how to handle AI in MusicBrainz… 
also adding that there was a lot of discussion on the Unofficial Discord about this topic starting about here and here (not sure if those links will work if you don’t have a Discord account, but I wanted to link it either way)
lots of folks looking forward to a “Software” artist type (now with a ticket!), including @Jeluang, @iolomorganwg, @aerozol, @Victini, and myself, all with different approaches in the interim. there’s too much to summarize beyond that, and I don’t want to misrepresent opinions either…