"You cannot put an absolute ban on activity if the reason for this is only protecting a business model," EU industry commissioner Elzbieta Bienkowska said at a news briefing in Brussels.
Online success stories like ride-sharing app Uber and Airbnb have caused major disruptions in Europe, with taxi drivers and hotel owners furious at the inroads made by the main actors of the sharing economy.
In response, local governments and national regulators have moved to limit access to the websites, and in some cases, outright banning them.
The EU is currently deliberating a response to those complaints as well as another lodged by an individual in Berlin who is unhappy with a local law against websites like Airbnb.
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The EU's Bienkowska warned against government overreach as she unveiled the European Commission's recommendations on how the EU's 28 member states should better regulate the sharing economy.
"Absolute bans of an activity should only be a measure of last resort," said the commission's guidelines.
"We invite member states to review their regulation in the light of this guidance and stand ready to support them in this process," Bienkowska said.
In one idea, the EU encouraged regulators to differentiate "between individuals providing services on an occasional basis and providers acting in a professional capacity."
It also recommended that sharing economy actors "fully cooperate" with national tax authorities amid accusations that the services facilitate tax evasion.
Uber welcomed the commission's proposals.
"Member States should review regulations that undermine the development of such services," he added.