Yes, for new house, developer will provide for you.
But if you want to reno, which is hacking the existing tiles and replace with new tiles, it might break the water proofing provided by developer.

Water proofing can be costly. If only simple injection, few hundreds will do.
But I am not professional, I can't tell what's the difference between simple injection and actual water proofing layer.

Bt I read thru and ceramic is more porous, so absorb more water. Over time won't cause issue?

want to ask, if water proofing really works on long term?
I have see waterproofing fail after few years especially those in condo/apartment. need to do re-tiling after 5~10 years above. Any other better solution?