I had the same thought as you but then have a look at the Etherium fork, the Bitcoin fork etc.
Bitcoin isn't the original white paper, to be carried on into infinity. Bitcoin is a brand. The white paper(s) and code can change (while honouring historic transactions) and adapt to changes in crypto, but you are still holding bitcoin, you are still buying and transaction bitcoin.
The word Bitcoin is essentially a "pointer" to the current accepted bitcoin implementation.
Bitcoin isn't the original white paper, to be carried on into infinity. Bitcoin is a brand. The white paper(s) and code can change (while honouring historic transactions) and adapt to changes in crypto, but you are still holding bitcoin, you are still buying and transaction bitcoin.
The word Bitcoin is essentially a "pointer" to the current accepted bitcoin implementation.