Sideloading isn’t a ticket-able offense. It’s just a name for a thing we are all within our rights to do. That’s not really comparable.
Now “jailbreaking” is a term I definitely take issue with as the language straight up makes people question the legality.
Originally jaywalking also wasn’t a ticketable offense. Do you know the origin of this term? That’s the parent poster’s point.
Does sideloading incur a fine?
Can you be arrested for it?
If the answers are “no” and “no” then there’s no parallel with jaywalking and there’s nothing to debate.
The answer is “currently no”, and that might change. Just like with jaywalking.