Bitcoin is a non-sovereign, hard-capped supply, global, immutable, decentralized, digital store of value. It is an insurance policy against monetary and fiscal policy irresponsibility from central banks, corporations, and governments.
Bitcoin is immutable (digital version of something that moves forward and cannot go back), and applies time in a digital sense and anchors it to energy (proof of work) which is the only thing in life we cannot forge, duplicate, or replicate.
Nobody can manipulate the supply of the 21 million bitcoin or increase the supply, thus you can be certain your shares are not diluted.