As far as I understand it, dark matter direct detection experiments are based off the idea that dark matter interacts with ordinary matter, it just has a very small cross section. So far, there's been no confirmed detection.

Is there any evidence at all that dark matter interacts non-gravitationally with ordinary matter at all? That is, is it possible that dark matter exists, but can literally never be detected because every non-gravity interaction cross section is exactly zero?

If there is evidence, what is it? If there is no evidence, why does this hypothesis seem never to be taken seriously?

Related: Is there any evidence for dark matter besides gravitational effects? and Why do physicists assume that dark matter is weakly interacting? However, neither question deals explicitly with the hypothesis that dark matter doesn't interact non-gravitationally.

As far as I understand it, dark matter direct detection experiments are based on the idea that dark matter interacts with ordinary matter, it just has a very small cross-section. So far, there's been no confirmed detection.

Is there any evidence at all that dark matter interacts non-gravitationally with ordinary matter at all? That is, is it possible that dark matter exists, but can literally never be detected because every non-gravity interaction cross-section is exactly zero?

If there is evidence, what is it? If there is no evidence, why does this hypothesis seem never to be taken seriously?

Related: Is there any evidence for dark matter besides gravitational effects? and Why do physicists assume that dark matter is weakly interacting? However, neither question deals explicitly with the hypothesis that dark matter doesn't interact non-gravitationally.

As far as I understand it, dark matter direct detection experiments are based off the idea that dark matter interacts with ordinary matter, it just has a very small cross section. So far, there's been no confirmed detection.

Is there any evidence at all that dark matter interacts non-gravitationally with ordinary matter at all? That is, is it possible that dark matter exists, but can literally never be detected because every non-gravity interaction cross section is exactly zero?

If there is evidence, what is it? If there is no evidence, why does this hypothesis seem never to be taken seriously?

Related: Is there any evidence for dark matter besides gravitational effects? and Why do physicists assume that dark matter is weakly interacting? However, neither question deals explicitly with the hypothesis that dark matter doesn't interact non-gravitationally.

As far as I understand it, dark matter direct detection experiments are based off the idea that dark matter interacts with ordinary matter, it just has a very small cross section. So far, there's been no confirmed detection.

Is there any evidence at all that dark matter interacts non-gravitationally with ordinary matter at all? That is, is it possible that dark matter exists, but can literally never be detected because every non-gravity interaction cross section is exactly zero?

If there is evidence, what is it? If there is no evidence, why does this hypothesis seem never to be taken seriously?

Related: Is there any evidence for dark matter besides gravitational effects? and Why do physicists assume that dark matter is weakly interacting? However, neither question deals explicitly with the hypothesis that dark matter doesn't interact non-gravitationally.