Denmark, Finland, Iceland, Norway and Sweden. None of these nations have an minimim hourly wage enshrined in law. Instead many of the base terms of employment, including wages, are decided via collective bargaining between sector trade unions and representatives of public sector and business interest organizations.
I live in Sweden by the way, so feel free to ask me questions on the topic and I’ll do my best to answer.
Strictly speaking, gig workers aren’t employed, but rather a contractor who is self-employed. This means that a lot of labour legislation doesn’t really apply (which would include minimum wages).
It is in the pipeline of legislation however, and I know that some unions have started targeting gig employers with collective bargaining. Foodora for instance is covered by collective agreement since 2021.