People said the same stupid things several years ago about Facebook. That is still not evidence of either dominance or vendor lock-in. Its just evidence of either addiction or ignorance of alternatives.

To be clear dominance is where one player owns market majority. That is not Twitter. There is lots of evidence on this. Twitter might dominate Truth Social but it still lags far behind Facebook, TikTok, and probably Instagram.

Vendor lock-in is where the cost to switch to an alternative is supremely expensive, such as rebuilding infrastructure from the ground up. That is radically different than the stupidity of not knowing what your options are.