I bought physical copies of most of my games and music when that was the norm.
Then, the model changed to "license to play" instead of owning. Not so happy with that (not going to lie) but also most of the games I buy online are like 20% what they used to cost.
Now, most of the games I play have DLC that you have to buy separately. Year after year, my conscience made me buy the important DLCs as well, or at least wait to get the "complete pack, game of the year" or whatever name they put that has all the major stuff.
Last year I said to myself: this shit stops right now. And I haven't bought any more games that have DLC (other than the ones which have "supporter edition" or cosmetics, or stuff like this).
Now I campaign against this shit model among my gamer friends, and as we tend to buy the same games to play together, it has been quite successful.
As you do, I think it truly disrespects the player. And I'm talking about side content, if it was paywalled core content I'd be pissed.