From another article on the same incident:

Grazie Mamma was a Jeanneau Sun Odyssey 449 measuring just over 13 meters in length. This fits the general description of the vessels targeted by orcas off Spain: According to researchers, the attacks always target sailing yachts measuring less than 15 meters long, usually while under way.

That kind of boat is 45' long (which is liveaboard-size for a family but still not much bigger than an RV), was at least six years old since they quit making them in 2017, and was worth somewhere between $150k and $250k. This one was was owned by a rental company, but it's the kind of thing a middle-class family could afford if they decided to live on it full-time instead of owning a house.

Translation: although this wasn't a "cheap" boat, it was also very much not the deservedly-sunk billionaire's superyacht you were hoping for. Unfortunately, the orcas aren't hurting the right people.