Yes I think Facebook and Microsoft may lose money on this, you could call that over investing, but for it to be a bubble that burst, companies need to go down, and people lose money on it.
Otherwise you may be looking for a completely different word which is fad, a period where something is over hyped, but quickly settles down like Fidget Spinners.
.com was a bubble because a lot of people lost a lot of money, so much so that it reverberated through the entirety of financial systems globally. I don't think we will see a financial bubble burst due to AI, that is more than 1% of that at most.
META is throwing out money like crazy on their "META" project that will never succeed, and they are doing the same with AI, but they will not go bankrupt on it, and AI will almost guaranteed be more successful than the "META" project.
What I mean is that generally more money will be made on AI, than is lost experimenting with it.