There is no standard rate, the pay scale is extremely wide. You can easily find people who'll churn out shitty PHP for 700 EUR/mo. It's not much harder to find someone who has considerably more skill and experience, and will require at least twice that. Highly skilled people who know their worth won't work for less than 2500 EUR/mo, and have no trouble finding employers who'll pay them that much, or more. Google pays around 3500 EUR/mo for new grads. All of these are gross numbers, and refer to Warsaw market. For other cities, there are fewer candidates, and salaries are 20-30% lower.

Overall though I'd say that developers here don't know how much they're worth, and sadly most employers get away with paying them less than they should. The reason it happens is that everyone else in other occupations are paid even less, so developers feel like they have it good, even though they can easily have it better.

As for the regulatory/legal system, there are some issues, but I don't think it's any better or worse than anywhere else. There are some incubators here, Google has opened Campus[1] just last week, but I think the biggest issue for wannabe-unicorns here is lack of the access to capital. Some of my friends bootstrapped their companies though, and it worked out quite well for them.

[1] - https://www.campus.co/warsaw/en