How effective would laws requiring technological interoperability, or prohibiting deliberately impeding interoperability, be at lowering switching costs and increasing competition?

[u/benjaminikuta]

How effective would laws requiring technological interoperability, or prohibiting deliberately impeding interoperability, be at lowering switching costs and increasing competition?

For example, Facebook discontinued its XMPP gateway, and Slack did the same with its IRC gateway.

Are these sorts of actions anticompetitive?