There seems to me to be a false dichotomy present in a lot of the comments here: either Google funds all web browsers, or all the web browsers will crash and burn and the modern web will die.
Linux is a project spanning many decades with thousands of contributors and is not owned by any company. The BSDs are similar. I do not see why something similar cannot be accomplished with the web; a group of FOSS developers, and eventually, perhaps full-time developers at all manner of companies, could support a modern web browser. This seems to work fine for Linux - many companies pay developers to work on Linux because their business depends on it, so it is a good investment for them. The same applies for web browsers - many companies’ businesses depend on it, so funding a browser is the cost of doing business.
Linux is a project spanning many decades with thousands of contributors and is not owned by any company. The BSDs are similar. I do not see why something similar cannot be accomplished with the web; a group of FOSS developers, and eventually, perhaps full-time developers at all manner of companies, could support a modern web browser. This seems to work fine for Linux - many companies pay developers to work on Linux because their business depends on it, so it is a good investment for them. The same applies for web browsers - many companies’ businesses depend on it, so funding a browser is the cost of doing business.