It's now possible to use the Explicit content filter on mobile and tablet devices (more devices coming soon!). Right now, the setting is only for the individual account and device. If you do apply the setting on your phone, it doesn't filter explicit content for the same account on the desktop app.
We're keeping this as a 'Good Idea' for now. Please know your feedback is reaching the internal teams at Spotify, and they're aware of the votes around this idea. We'll continue to check out the comments here too.
Just as a heads up, be sure to check out the 'Create Similar Playlist' option on the Desktop and Mobile apps. You can find it by clicking the three dots on most playlists.
Thanks for adding your feeback about bringing parental controls to Spotify. We also think it's a great idea and we're looking into it further. We've changed this idea to 'Under Consideration' and soon as we have any further updates we'll keep you posted.