The supply isn't infinite, just because most of us won't live that long to see Bitcoin reach 21 million doesn't mean it's infinite for us. It's true one can't own every Bitcoin because of several reasons like many people own a portion and it's impossible to buy everything because there's no accurate number of Bitcoins in circulation.
So my point is BItcoin, Ethereum and Gold all have an infinite supply and are being created infinite at least during our lifetime and even people born 50 years from now will never be able to run out of ming neither gold nor bitcoin nor ethereum- its a fact
To describe your meaning of infinite is there's enough supply for all of us to share because everyday there's new Bitcoins being mined but the amount is specific and that's not infinite.