I don`t think you can say that.
First, they don`t aquire as agressivly as AD, second, they do not have the habit of letting bought technology disappear.
On the contrary, I`d say. Redshift and Red Giant are getting meaningful updates fast and often.
Nothing like Autodesk - even with their own top products.
The only thing I "fear" is that the days of free updates will be gone and they sooner or later move on to subscription only. We`ll see...
CHeers, Klaus