To remove watermarks or use those features you mention you need “Pro”.
Pro costs $4.99 a month, $39.99 a year, or $79.99 for a lifetime license.
I hope they survive.
They have the advantage of working with older devices like the iPhone 6S and iPhone 7, both of which have excellent cameras that are better than most webcams I've tested them against!
I also doubt Apple will include the other video tweaks you mention.
I have epoccam only for emergencies (like when with covid webcams were sold out)
You can connect to the phone over either lighting or wireless. If you do it via lightning then you don’t burn the battery at all.
Now I don't care. I look more than good with a Logitech webcam and some proper lighting.
And then even if it is an issue, it’s pretty cheap to just replace the battery later. All this stressing over battery life is pointless.