Because mobile games that aren't free do not sell (except Minecraft). In mobile F2P space you can end up with tons of downloads, with less than 20 cents per download, because majority of the players are free casual ones, who play few hours or even minutes, and 99% of your revenue comes from the so called 'whales' (players who spend a LOT of money). If you hate this business model - good for you, I do too and I don't do mobile gamedev, but it's a reality there and Unity knows it.
Unity also doesn't give a crap about quality unless by quality you mean microtransactions, milking players and ads/adware. The engine is associated (partly unfairly) with lagginess, low performance, high ram usage, and crappy games and assets flips. Unity is famous for how slowly new features come and how buggy it is in parts. They also scrapped their own game on Unity that was supposed to show how to use Unity right, it's an engine company that never made games (unlike Epic or id Software, who made games first, engine seconds, and even when being in engine business they kept making games). Unity users who just slapped few assets together basically created the asset flip genre, the opposite of quality. As CEO of EA Riccotello supported always online online DRM that shut down singleplayer games on release day due to servers dying, as CEO of Unity he said you are a "fucking idiot" (direct words) if you don't want to maximize your monetary return from your players. Unity bought an adware company, Unity has an ad network (and if you use it to put ads in your game, they waive the install fee, curious..).
Unity also doesn't give a crap about quality unless by quality you mean microtransactions, milking players and ads/adware. The engine is associated (partly unfairly) with lagginess, low performance, high ram usage, and crappy games and assets flips. Unity is famous for how slowly new features come and how buggy it is in parts. They also scrapped their own game on Unity that was supposed to show how to use Unity right, it's an engine company that never made games (unlike Epic or id Software, who made games first, engine seconds, and even when being in engine business they kept making games). Unity users who just slapped few assets together basically created the asset flip genre, the opposite of quality. As CEO of EA Riccotello supported always online online DRM that shut down singleplayer games on release day due to servers dying, as CEO of Unity he said you are a "fucking idiot" (direct words) if you don't want to maximize your monetary return from your players. Unity bought an adware company, Unity has an ad network (and if you use it to put ads in your game, they waive the install fee, curious..).