According to the article, the payment system would first deal with fiat currency but might eventually be built to include crypto. If Twitter is finally able to cope with bitcoin, it might provide it with a high-profile mainstream presence. Musk has already permitted his electric vehicle company Tesla (TSLA) – Get Free Report to take dogecoin for payment, so this is not his first foray into cryptocurrency.
The possibility of dogecoin being utilised on Twitter would give it more publicity and, maybe, a chance to compete more effectively with others like bitcoin.