This is a fair observation, and it’s certainly possible that they get disrupted like this. (I find the “cannibalizing legacy business” fear most plausible of these).

However I question your level of confidence. The idea that a company is incapable of avoiding being disrupted is pretty dubious; now that disruption theory is well understood by all executives, it’s possible to take steps to avoid it.

For example, DeepMind is an Alphabet company, and they could push them to make chatbots profitable completely ignoring Google’s ad market. They could even transfer tech/people over and to give them a boost in productionizing their efforts.