And since you won't be able to modify web pages, it will also mean the end of customization, either for looks (ie. DarkReader, Stylus), conveniance (ie. Tampermonkey) or accessibility.
This is why tech monopolies are bad. Google waited until they had a near monopoly on the browser engine and then pulls this shit. Alternatives still exist though, and people will vote with their actions by either not using Chrome or not using those websites that have DRM.
I fear the number of sites taking that hit would be so many that we may feel excluded from the web. It feels really dangerous and we need more people on FF asap to make it clear to businesses that this is too costly to be worth it and they're losing a lot of users.