The problem with that is people are "lazy": they're typically not going to expend extra effort that's not needed to solve the problem in front of them. It's pervasive, and it's one of the big reasons "friction" reducing technology can be really problematic: it turns necessary behaviors into issues of self-discipline (e.g. exercise becomes forcing yourself to haul yourself to the gym regularly in your spare time, instead just walking everywhere because you have to in order to go about your day).
So, IMHO, if you want people to use "open, decentralized, and user controlled" tools in 2026, you have to ban the centralized alternatives. Otherwise you're yelling at clouds, as most people will default to the lowest friction alternative they have access to.