Bitcoin is deflationary
No, Bitcoin has not (and will not ever be) deflationary in our life times.
Bitcoin will inflate until approximately the year 2140.
For the first 2 years of Bitcoins life the network sustained an annual inflation rate of over 100%.
For the first 5 years it was over 30%, and for the first 8 years it was over 10%.
The point is bitcoin inflation rate is going down while steem inflation rate is not.