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I switched away from Ubuntu when they started putting advertisements in the motd and login screens.

That didn't bother me much as it is "advertisement" about things related to my system.

What I did not like was Firefox taking 20s to start.

No I’m not talking about useful things like last login, average cpu, etc. they were advertising their cloud products.

Ubuntu has (used to at least) ads as apps in the app launcher, served by canonical and not at all related to the software you're using.