If you’re looking for an affordable map-making tool for RPGs suitable for use with a VTT a good contender is DungeonDraft which comes for an affordable $19.99 which weighs in around €20.
While it doesn’t offer the same rich variety in terms of assets out of the box as say for example Inkarnate. There are many free assets available for it on CartographyAssets which closes the asset gap quite quickly.
The fact that it’s a once off payment rather than an ongoing subscription means it quickly pays for itself. Can recommend enough if you’re looking to create quick maps for VTT sessions. Added to which there is nice integration with Foundry VTT if that’s your thing.
Here’s two examples of maps I’ve recently used in RPG game made only using the default installed assets.
The Blacksmiths Shop
A section of a village the party recently visited showing the local Blacksmiths store and accommodation. The store having a open stall window at the front with the smithy to side and family quarters behind.
The Old Watchtower
A point of interest the adventures had to explore was a recently abandoned watchtower and the mysterious cavern linked to it below. Where the recent disappearances of villagers connected in some way to its sudden abandonment? Probably not.