Most of them did and still do. Because right now and at the time very few people accept crypto. But that's okay, they accepted them and if you are gonna bootstrap a currency without force, that's how you do it. As they see that more and more of their expenses could be in crypto, they would start to save more.
But some kept some in crypto mostly as a speculation. This was when the frenzy was high, Bitcoin going from $12 to $1200 in a year. People did notice and wanted to get in the action. When people went to crypto meetups at the only restaurant that accepted Bitcoin in town etc. These guys were sometimes believers themselves, but some only did it to seem modern or to make a quick buck.
Newegg, Overstock, Tesla etc held a lot of their bitcoins at least for a while.
Anyway, lots of these discussion have been held before. Does it matter if prices are in dollar? Does it matter if it's converted to dollars instantly? Etc etc. See these old debates from 2013:
"But some kept some in crypto mostly as a speculation."
Because that's all it is: It's not a currency, it's a Ponzi scheme and some people hope to still make money by not being the last ones in. The only way anybody makes money in crypto is when somebody else forks out their own money for it. It's a zero-sum game and always will be. Speculation on currency is the same, but real money serves a real purpose: mediating trade and financing investment. The wild instability of crypto makes it useless for either.
"Does it matter if prices are in dollar? Does it matter if it's converted to dollars instantly?"
Yes, it matters, because it shows that crypto is useless as currency, except for illegal activities where the wild instability in value is justified by the secrecy. Crypto's only uses are speculation and crime.