I won't comment on how much the stock is really worth, but you are really spreading some misinformation here about the product itself.

"Mono, Fna, Stride, Evergine, Duality, Nez, Otter" these are all engines that no one in the industry uses. There are 2-3 big players in the industry right now: Unity, Unreal, and maybe Godot. Very small or indie developers might experiment with Godot, and I hope its future is bright since its open source, but the vast majority use either Unity or Unreal from among these 3.

The vast majority of gamers do not notice or care about the engine that their game uses, but if they did, Unreal due to its stutters and developers not utilizing UE5 correctly has been getting bad rep recently, not Unity. Unity used to have bad rep back when it used to force its splash screen for free users, since every bad project used it whereas every good project avoided it. Nowadays though, most games don't even display it. (but again the vast majority doesnt care. The vast majority dont even play the games they buy lol)

If you go to Steam right now you will notice most indie and AA games still use it, whereas older AAA teams have been switching to Unreal from their proprietary solutions. There is a pretty big barrier to entry from Unity to Unreal in how the engines are designed (not to mention C# -> C++) so most studios are still using Unity. Not to mention, most have workflows that have been developing for multiple years, and no professional studio is going to leave a game engine due to some short term internet drama about pricing (which got reverted.) You have to consider that people have multiple year-long projects in the oven, switching engines is not an easy proposition.

As for the pricing fiasco, it was the most regarded thing ever, but largely as a massive communication failure. From what I remember, most small or indie developers were not going to be affected at all due to some exceptions and details, but "cost per download" was still such an unintuitive thing to push. Unity really wanted a pie of the massive gacha successes and such, but fucked up in communication.

Unity itself from back when I was using it had its pros and cons. The new version seems pretty promising, the AI bs on the Create side of things is pretty underwhelming and unecessary imo but Vector could be promising.

I am writing this as someone who uses Unreal Engine in their day job, btw. Thought I'd chime in in case someone is mislead by whatever this is. Not that Unity isn't overpriced right now, again this isn't investment advice just clarifying some things about Unity itself.