Except, they used SI units (mega, giga etc) then multiplied by 1024 implying IEC units.

Something that most people don't tend to adhere to is SI units (MB, GB...) Are base 10, or a simple 1000 of each other. If you're multiplying by 1024, you're dealing with Mibibytes, Gibibytes etc, or MiB GiB etc in their short IEC form.

For reference, this is on U22.04 LTS, so still a current version of Ubuntu.

I could understand pushing it if I was EOL, give me a message going "you don't get updated packages because your version is EOL, but if you were an Ubuntu Pro member you'd get xyz", but not in the situation where I'm using a valid and current release. It's the gatekeeping security patches that i take issue with - one of the packages in the list was imagemagick, so iirc that's open source too.

By the way there’s a free version of the subscription for personal use up to 5 devices I think, maybe more maybe less.

Yeah, handy, and I would be under the 5 device limit, however I'm more likely build a new PC and focus harder on Linux compatibility, and then go back to Debian tbh. I get that it's a hard line to walk trying to be commercially viable and provide a free OS, but every time I venture back into the ecosystem I last maybe 6 months before something happens that I take issue with and leave again. Canonical strikes me as the type of company that would go full MS/Apple/Google if they were in the position to do so.