I know there have been a few, but the one I know most about and has affected me most (professionally) is when they acquired Sun.
Ok. I am curious if you think there was another option for Sun? Do you think it could have remained independent and had any hope?
- They immediately closed source Solaris and ZFS, both of which had large communities contributing code. It was like a slap in the face.
Sun open sourced both Solaris and ZFS (with an incredibly restrictive license) at the point they could not afford to develop them on their own. I thought the move on Oracle's part was dumb, but I am not sure it really had any impact on ZFS and I think Solaris was on a path to doom already. As an aside, it was that license (that allowed Sun to return it to closed source whenever they wanted) and Jonathan Swartz's inability to keep his mouth shut that eliminated ZFS as part of macOS.
- They immediately changed licenses for several Sun-owned technologies, especially Java, such that there were more restrictions on usage.
This one I know about bit more about. They did not really change the licenses, as much as start enforcing them. Again, Sun's Java license restrictions were among the reasons Microsoft opposed its adoption for things like set top boxes.
- They neglected the SPARC architecture (which we were quite invested in at the time) and eventually stopped development and sold it off.
SPARC was doomed, in exactly the same way as PowerPC and PA-RISC were. Sun just did not have enough money or a large enough customer base to spend what it would have needed to keep them competitive. Had Oracle not bought them, the result would have been the same.
Basically they bought Sun and got rid of all the great things about it.
I am not sure when you started using Sun Microsystems gear, but as someone whose first Sun Microsystems machine was based on the Stanford design, I have tracked them since the beginning. Oracle was able to buy them because under Jonathan Shwartz they were on a path to destruction. They had lost most of their best engineering talent to other valley companies and were flailing. To blame Oracle for their demise is a bit skewed.
Oracle has a certain greed about them; anything they buy will be squeezed to get as much profit as possible out of it; screw the community.
MySQL seems to still be doing well. So does VirtualBox. Both seem to hav solid, ongoing development. Both are still open source.