Can a bathroom outlet be wired to a GFCI in another bathroom

Answers in order:

1) If the kitchen was done properly in the 90's you definitely should have GFI protection, at least near the sink(s). If not then yes, you cetainly can install a GFI at the head of the circuit and protect downstream standard receptacles. Keep in mind, only receptacles serving countertop areas require GFI protection.

2) IF the house is that old GFI protection was likely not required at the time of original installation. You can if you like add it at any time, and it's the same situation as the kitchen. Downstream protection is fine.

3) See answer #2. I doubt there is a need for an actual GFI device behind the freezer.

4) Again, same goes. You can just use one GFI at the beginning. As for how many, there is no limit, but each downstream device does have a tiny bit of current leakage, so limiting them to 5-6 is a good idea.

Remember, to gain downstream protection, the incoming line must be on the LINE terminals, and the line to be protected must be on the LOAD terminals.

This isn't "dangerous", but it can be inconvenient when your outlet goes dead and it's tricky to figure out where the GFCI reset button is.

On the other hand, this could be against your local electrical codes. For example, NEC 210.11(C)(3) states that your bathroom circuit may only power bathroom outlets. Note that there is an exception to this rule: When the circuit supplies one bathroom (i.e. isn't shared between bedrooms), other things (such as fans and lights) in the same bathroom can share the same circuit. Regardless, the mentioned situation is against the NEC code.

As to if the builder should modify this, I can't say. When in doubt, call your local building inspector.