Well if its opensource anyone can easly get ride of the adds.
I agree with you that developers schould be paid but there is many ways to be paid we all fight for privacy and against adds on the internet using adblocks for example i personaly always pay for developers fairemail and typewise to rename few but i dont like to be forced to pay and in between my phone are establishing connections to the adds servers exposing ip addresse connection times and so on adds are not only adds there is a lot of metadata that can be extracted from adds.
And finally the purpose of developing opensourse apps is to serve the community with more friendly apps than the big companies offers to us.
But... its just me saying that....