There is free region available. Also you can unlock the region bundle or global region via single-time payment (see
here for available options). However their premium subscription adds pretty much nothing valuable for me, so I just bought the world region and using it (see
here for World Pack / Region Pack vs. Premium comparison).
Many of my gravel riding buddies confirm what you are say about Komoot as the service is becoming increasingly popular here.
Komoot is Europe-based, so technically their coverage of Europe should be great (definitely not worse than US-based RideWithGPS).
The accuracy of a route planner greatly depends on the maps selected by the developer; in this respect, RideWithGPS is excellent for Europe. There is another matter, which is how well a route planner can meet your desires and type of ride (like "road cycling, e-bike"). RWGPS is devoid of the "ride type" option!
I am planning a Double Metric Century route from my near neighbourhood to a location near the city of Toruń where my B&B is located. The default RWGPS route was simply boring, non-optimal and pretty long.
Now, following your advice, I unlocked all regions for the flat fee in Komoot. Asked the same question for the A -> B route to get as many as
five alternatives! But hey! Komoot allows you selecting the
type of your ride! I chose "e-bike road cycling" to immediately get the optimal route! Interesting and the shortest! Komoot warned me that 874 m of the route would lead through inappropriate surfaces! More: It allows you displaying exactly the type of Points Of Interests (such as a grocery store or restaurant) on demand. Finally: the feature called Trail View is reportedly available in Komoot, so you could actually see the picture of your trip segment to make sure it is rideable! (Only I do not know how to use it).
Thank you for drawing my attention to Komoot
@ava1ar! The service looks excellent for my needs! (RWGPS will remain my advanced editor for already planned routes in other systems).