Then you must not have read the linked article, which mentions three companies that have done just that.

Roaming charges made an unwelcome reappearance for UK mobile users heading to mainland Europe after Brexit. EE, Three and Vodafone were all quick to reintroduce the daily or monthly charges to use their mobiles while in the EU – which typically add £2 a day.

There are definitely VSCode extensions which ask you to pay for them, like GitLens.

most newly created apps are using flutter

Do you have some examples? I’ve never heard of any desktop apps using Flutter, and trying to Google for examples only leads me to obscure ones I’ve never heard of.

There’s no restriction on distribution. You’re free to distribute the GPL software you got from Red Hat.

They’re under no obligation to ship you other, different software in the future. You’re only entitled to get the source for the binaries they distributed to you. If they never give you the next version, you have no right to its source.

They absolutely can, but RHEL Red Hat will likely stop doing business with them if they find out (and thus stop giving them new versions), hence why they would only be able to do this once.

It doesn’t. The GPL is satisfied as long as they provide you with the source code for the version of RHEL that they distributed to you. But they’re not obligated to continue distributing later versions to you.