This could be the right plumbing for your case:

• Create the curve to be followed
• Create a plane, an array of which will act as a mount for your objects
• Assign the plane an Array modifier, (Possibly set to fit your curve)
• Assign the array of planes a Simple Deform > Taper, along the array axis
• Assign the tapered array a Curve modifier, deforming it along your curve.

Now, in the plane's 'Object' tab > 'Instancing' panel, set it to instance from faces, with 'Scale by Face Size' checked. The 'Factor' can be adjusted:

Parent your object to the array of planes:

You can adjust the interval, taper, scale factor, etc, and hide the instance original and the instancer from the viewport and/or renders.

This could be the right plumbing for your case:

• Create the curve to be followed
• Create a plane, an array of which will act as a mount for your objects
• Assign the plane an Array modifier, (Possibly set to fit your curve)
• Assign the array of planes a Simple Deform > Taper, along the array axis
• Assign the tapered array a Curve modifier, deforming it along your curve.

Now, in the plane's 'Object' tab > 'Instancing' panel, set it to instance from faces, with 'Scale by Face Size' checked. The 'Factor' can be adjusted:

• Parent your object to the array of planes:

You can adjust the interval, taper, scale factor, etc, and hide the instance original and the instancer from the viewport and/or renders.