Basically guaranteeing themselves the worst code source.

if you are entitled to using a paid version for free (e. g. students, educators) you cannot opt-out of sharing your code.

That is incorrect. According to the page you linked elsewhere:

For individuals on non-commercial licenses: Data sharing is enabled by default, but you can turn it off anytime in the settings.

(Emphasis mine)

And for all other cases it's opt-in. No idea how you got from that that you cannot opt-out. It literally says the opposite.

Tbf they will just take from people who opted out regardless no? It's not new for companies to do that.

I might be mistaken, but I think that if you use the free version, it's also opt out, because IIRC it's also an individual non-commerecial licence.

For individuals on non-commercial licenses: Data sharing is enabled by default, but you can turn it off anytime in the settings.

At least on the prouct page, the free tier is literaly called "Rider Non-commercial", under Individuals tab.

From the other comments, it sounds like it's opt-out for the free tier.