About a decade ago Dogecoin made a big push to get online and offline business to accept it. Making a block every minute was quite beneficial for that, and the price used to be somewhat stable. Today nobody pays in Dogecoin. Lots of companies that used to except Bitcoin/Litecoin/Dogecoin stopped doing so because off lack out demand.

The issue isn't that crypto currencies can't be used as currency, it's more that they don't get used as currency outside niche use cases because they don't have a good USP. Most countries have decent enough currencies and payment systems