The seats are still owned by the restaurant and designated for people who have paid for meals. They don’t typically welcome people who are not buying to come sit down. So it’s not a “shared resource”. You pay for a meal, you get a table until you’re finished. If you want to share that table or not is up to you or the rules of the restaurant.
Two people can’t sit in the same chair at the same time, so it’s a shared resource.
And again, we’re not talking about ownership, we’re talking about usage, by ALL customers.
You’re being intellectually dishonest, and it shows with the quality of your responses.