Guilds were anti-competitive and anti free market, in that they regulated the number of people who could enter a profession, and practice it in a particular town. As such, that's against the interest of employers and most people who want to enter the profession. I don't think guild members generally worked for employers, except for apprentices, who had to work for a guild member; they were business owners or self employed.

Arguably though, medicine and academia are guilds.

Early guilds probably used violence to restrict entry; later they needed the state to enforce guild restrictions, so when the state decided it didn't want to; that guild was over.

I suspect that cooperatives are a better model than guilds for the modern era.