By that “no true Scotsman” definition, there are very few commons. All land is owned by someone and there are still tragedy of the commons scenarios.

The important bit for a tragedy of the commons is that the users don’t have any meaningful ownership or motivation to fix the system.

The town commons where people grazed their livestock was literally owned by the government. Be it the government or a faceless company that doesn’t charge for it, it doesn’t make any difference from an economic perspective.

> Google owns their hard drive space. Also a commons has the implication of everyone having access to access said resource.

No it doesn’t. A commons has the implication that everyone in a particular community has access to something. A tragedy of the commons can easily occur within completely gated communities with the commons owned by a private corporation.

> By that “no true Scotsman” definition, there are very few commons. All land is owned by someone and there are still tragedy of the commons scenarios.

> The town commons where people grazed their livestock was literally owned by the government.

That's not really true; the pre-enclosure commons simply wasn't owned in the sense we'd understand it today, just as Native American land was administered in ways we wouldn't recognise as ownership. Treating land as akin to chattel is a relatively recent development.

It was owned in the sense that mattered. A governing body could make changes to the land or its use if it cared. Even in Native American tribes they made rules about how to use different areas.

The critical relationship in the tragedy of the commons is misaligned incentives between the users and the owners. Users have incentive to act greedy and the owner has no incentive to fix it because it doesn’t hurt them if the thing stops being useful for that activity.

> It was owned in the sense that mattered. A governing body could make changes to the land or its use if it cared.

Not really. Often there was simply no entity that exercised executive function over the land or its use, which is a large part of why even plainly dysfunctional arrangements persisted.

The idea that there must be an owner to incentivise is modern and ahistorical. As traditionally conceived, the tragedy occurs not because "the owner" has the wrong incentives but because there simply isn't an owner. Pre-modern states didn't have the capacity to administer land in that kind of detail, even if they'd wanted to.

If you have unlimited access to said disk space for a nominal fee, that’s commons.

Similarly, if you rent a hotel room, you have free access to common areas like the pool or lounge. Normally this works wonderfully, until a big party takes over the common space.