Almost nobody thinks of DLC when they talk about F2P games, except for the people making decisions in the Google Play store dev while being clueless and divorced from the actual market.
I think there's no need to worry about or bring that up.
I'm not talking about a definition for nerds, I'm sure everyone on this forum knows the difference. I'm more after something that can be presented to a politician and be acted upon.
And most politicians either have no clue or don't care about the difference between DLC and IAP, for them it's the same - you pay for "new" content in a computer game. Have enough voters complain to them and they'll cluelessly enact crap as laws.
Well what's getting quite popular these days is the concept of a "loot box" which is where you spend some real money to get a box of unknown items.
When you open it you get a randomised, by whatever factors, set of items/powerups/whatevers. It adds a bit of a gambling aspect to it where a user might want to pay again to have another roll of the dice.
I think there's no need to worry about or bring that up.