Yes, "Brilliant" moves, as they are currently defined, aren't really brilliant. They are just sacrifices deemed appropriate for your rating level.
Chess.com is always working to improve and last year they changed the definition of what gets called "brilliant". The older definition resulted in only a very few often obscure moves being called "brilliant."
Brilliant (!!) moves and Great Moves are always the best or nearly best move in the position, but are also special in some way. We replaced the old Brilliant algorithm with a simpler definition: a Brilliant move is when you find a good piece sacrifice. There are some other conditions, like you should not be in a bad position after a Brilliant move and you should not be completely winning even if you had not found the move. Also, we are more generous in defining a piece sacrifice for newer players, compared with those who are higher rated.
The new definition calls every little halfway decent sacrifice "brilliant."
They need to keep working on it.
I made brilliant moves in 2 recent games. Very exciting for a beginner! Earlier today I found the insights tool but it says I have made 0 brilliant moves in all my games, whyyyyyy.