Sadly, at least in the Netherlands, most restaurant have to pay extortionary prices to aggregator sites like The Fork and others, that most people use to find restaurants and reserve a table. In addition they are incentivised to offer reduced prices on their meals, so the algorithm ranks them higher. So dominant is the role of the aggregator that the restaurant cannot afford not to be listed, and lose the customer base that flows in through these aggregators. Having their own website is of lower concern than doing this well.

I imagine location matters even more? A well placed restaurant with adequate food probably does good business, still?