Ugh. Lemmy just deleted my whole comment because "Cancel" is WAY too easy to press... Dammit. Here's a reconstruction:
I didn't expect such a thorough reply! I still think Google is bound by LGPL because Blink is eventually derived from KHTML which was licensed under LGPL. This was based on just some quick Wikipedia "research", but now here's some better proof thanks to your links:
The terms and conditions vary from file to file, but are one of:
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
[...]
*OR*
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
[...]
THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
[...]
GNU LIBRARY GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1991 Free Software Foundation, Inc.
[...]
So the license differs from file to file, and importantly, some files are still LGPL. Clicking around sorta randomly I've found an example: Page.cpp which starts with this copyright notice:
/*
* Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All Rights Reserved.
* Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
So from my understanding of (L)GPL (which is the bare minimum understanding and potentially wrong), since some files are LGPL, Google must continue to release the full source code indefinitely, including the files that are licensed under BSD. Well, until the copyright on the LGPL files runs out, but thanks to Disney that's a very long way away in the US at least. Correct me if that's wrong.
The Android tragedy is shit but I don't think it's the same, though I do see the similarities. IIRC Android was started by Google so they have full ownership and control over it and aren't bound by any license, which is a different situation from Blink. Not to mention Blink is sort of limited in scope and can't really be taken apart and have its components parted off and replaced with proprietary bits - it's a web rendering engine, it only works as a complete package. Android is an operating system and the operating system is still FOSS, Google can make the argument that usable default apps aren't a necessary part of the operating system.
With Blink, but I don't think they have a legal way to nerf Blink FOSS to that degree. Any part of the web engine must remain FOSS. They differentiate their browser through the rest of the browser - UI, extensions store, sync, branding. Those parts of the browser are the equivalent of Google's proprietary default apps on proprietary Android.
As for alternative browsers using Blink - I'll admit I didn't actually have anything in mind and pulled that right out of my you-know-where. But it feels like if there's a vacuum in that space there'll always be someone to fill that vacuum. Right now Gecko is still relevant so the vacuum is filled with Gecko browsers. If Gecko really becomes unusable, I find it hard to believe that the same kinds of groups that maintain Gecko browsers today wouldn't continue to do the same with Blink.
Wikipedia also lists various browsers using Blink, including Falkon and Dooble licensed under GPL and BSD respectively. I haven't heard of them before, but there. (Again, I'm not doing more research than Wikipedia right now, feel free to do so)