What do you do if websites are "best viewed in Chrome"?

Embrace: Embrace the open web, create an excellent product and aggressively promote it until you take over the market

Extend: Chrome experiments and advanced features that improve the user experience and developer experience through Chrome only API and Google services. Even provide these services to everyone who wants to use them free or charge so that the user expectations are elevated to that point and web businesses depend on these by building their products around them. Maybe make developers depend on this "topics" feature even.

Exterminate: Cut off or degrade the free services to 3rd party browsers, remove or tame extensions that harm your business and recoup the costs of the free services. Since you no longer have viable competition, reduce the development of Chrome any further, optimize only for profit. Developers who depend on you ad tech can choose to refuse serving users using another browser or opt out of Google verification or account services? The users will stay like they sat with IE.

IE of the 2020s.