They won't try to stop you. The average persons indifference will do it for them. Most people won't build Signal from source or let you install it for them. Any

They won't try to stop you. The average persons indifference will do it for them. Most people won't build Signal from source or let you install it for them. Anyone who does won't get any updates, so over time the installed base would be vulnerable to attack anyway. Since less people would have Signal then less conversations would be protected by it in practice.