Bromite author here (https://www.bromite.org ); I was contacted some time ago about the possibility to maintain a modified version of Bromite with a customised /e/ home page and list of search engines. Nothing particularly murky there, but after some Q/A I did not want to proceed with this type of cross-branding because fundamentally I do not want Bromite to be using or be affiliated with any cloud service and I concluded that /e/ invites users to swap Google for /e/ as a cloud services provider.
Now to the reason why I am commenting here: there is no GPL violation for the patches used in their /e/ browser but I find it a bit disappointing that nowhere it is mentioned that the browser is a complete Bromite build, minus the logo and renamed to '/e/ Browser'.
Most users are assuming that it is a Chromium fork developed by /e/ and will never reach the Bromite open source project, which is basically the way the project is kept alive.