We put wooden worktops in our previous kitchen. 10 years later looked as good as new, with very little maintenance.
They must be installed correctly, to start with. Ours were fitted by a carpenter, not the kitchen supplier. Each work top had three coats of specialist oil, both sides before being installed. Drying for 3 hours in between. The joins were Mortise and Tenon joins, for strength.
Where the dishwasher was going and the sink, the underside of those bits had a couple of coats of polyurethane.
When installed the top had two more coats of oil, letting it dry thoroughly between.
After that they could be cleaned with a mild anti-bac solution.
The only maintenance was an annual re oiling.
I did put clear glass work top savers either side of the range, old habits of putting hot things down, die hard! I also had a small rubber mat under the kettle.
Loved the wood work top. Our new house has lovely hand painted wood cupboards, but a laminate pretend wood work top. We will replace the work top eventually.