Are you really updated about cryptocurrencies? Of course it is useful on us, we can used it as a way of payment for online transactions like buying or selling something through social medias. And if you are not updated, there are lot of fastfood chains where they accepts crypto for their foods and there are also atm machines accepts cryptos. Btc hits its ath, but we hope that it will hit more than 100k usd this year.
But there was no massive adoption yet, and the reason why bitcoin has pumped and make a new ATH was not that, it was the institutional investors risking their money in crypto and people followed and got FOMO.
Restaurants or any businesses are not all ready to accept bitcoin yet, just imagine what would happen to their business if they can't manage bitcoin's volatility, and the fees are high. It's not time yet, well, eventually with the help of a 3rd party software, we will be able to minimize the fees and prevent its volatility, but for now its' not fully adopted yet, one example is the LN.