Generally, the legal ramifications are a requirement to register the name and pay a small fee. In Santa Clara it costs $40 to register a fictitious business name with the county and the registration is good for five years: https://www.sccgov.org/sites/rec/Fictitious%20Business%20Nam...
It's really not a big deal.
Do I think SeeFood Technologies, Inc. is factually incorporated in a US state? No, I do not. I checked the four states it is most likely to be registered in (Delaware, California, Wyoming, and Nevada) and it isn't registered in any of them. Corporate registrations are a public record and trivially searchable; if I had access to Lexis-Nexis or similar I could probably run the search nationwide roughly as easily.
A sibling reply suggests that getting a Fictitious Name / DBA issued might be sufficient, but this would depend on the state/county/etc; some of them prevent folks from registering fictitious names with things which suggest actual corporations (like Inc.) or various things which the state wants to protect ("Bank", "Trust", "University", etc are common).
(DBAs are available like candy and might make a lot of sense if you've got e.g. an LLC which operates a product whose name is not the LLC's name, if for no other reason than "You'll possibly need this to convince your bank to let you deposit checks made out to $PRODUCT_NAME into $COMPANY, LLC's bank account.")
If not, I'm curious what the legal ramifications are of doing business as a corporation that does not exist.