It would be based on the terms and conditions (or terms of service) that you agreed upon when you registered with eToro. Take note that not all users are under the same T&C so be sure to read them under the right operator (e.g. eToro UK Ltd. or eToro AUS).
In case that you're trading real stocks and these are under your name then you will be able to liquidate these shares. Do take note that this is only applicable for REAL stocks and not derivatives which are CFDs (contracts for difference). CFDs are traded based on the performance of an asset so you actually do not own them at all.
But also keep in mind that eToro is part of the Investor Compensation Fund for Customers of Cypriot Investment Firms (CIFs). This fund will be used to compensate their clients should their operations cease and they fail to meet their financial obligations. In this way, you will be able to file for a claim for the remaining funds or equity in your account. The current coverage for each client is up to 20,000 Euros. This should give you some peace of mind in case eToro goes bust.