Just plugging this thread here: Block ads on Sailfish 4.4
If apps become infested with ads, people will find a way around it. Please don’t ruin SFOS.
An often repeated argument is that ads are to help (hobby) developers. In my opinion (I don’t have statistics to back this) income from apps and ads is too much of a hassle for tax reasons and because of fees, etc. for normal people. Even accepting donations is quite hard to setup in a legal and transparent way.
Ads will not support individual developers who build apps in their spare time - yet these are the people who keep SFOS going.
Also, ads will not attract big businesses to suddenly build apps for a tiny niche market like SFOS. Neither paid apps nor adware will solve the problem of missing banking apps, login apps, chat apps, … that are only available for Android/iOS.
As others have said above, the only thing ads will attract is spammy adware. There might be a few apps that use ads responsibly, actually helping a constructive developer - but is it worth it? If they have the means to legally get income from ads, they may as well leave users the choice and accept donations.
Leave users the choice; forcing ads is just detrimental to everyone involved.