Have you talked to folks behind prior startups in the space like layervault?
See http://web.archive.org/web/20150424103031/http://layervault.... and https://kellysutton.com/2015/07/21/startup-theory-of-relativ...
See http://web.archive.org/web/20150424103031/http://layervault.... and https://kellysutton.com/2015/07/21/startup-theory-of-relativ...
To their point though, I largely agree with this, "The only thing I’ve found to be effective at dealing with competitors in early stage companies is to ignore them."
Did you ever get a chance to use their product?
This is something that really motivates me about offline first/OSS stuff though. It will be inconvenient for those who adopt if we have to shutdown but it's still possible to use floro without needing our servers. You will end up having to host your own though.
I wasn't a professional designer so never had a need for layervault, but it had quite a bit of polish for its time.
Another app in the space has been https://kaleidoscope.app/ (Mac only) which is still around but doesn't market specifically to just images, I think the parent company has changed hands (was owned by Black Pixel, then Letter Opener GmbH, now owned by Leitmotif)