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I have been using the Heroic launcher a ton on my Steam Deck, it is great!
I am not sure if you replied to the wrong thread, good for you that it works for your needs, but
My point is that GOG did not drop Linux support and instead partnered with another company. Not about the quality of the software.
That said, it is shady to inject links and not notify it on the release note or change log. I think there was a message on their mastodon at some point, and the implementation crashed for some people with more restrictive firewall on their network, there were some discussions on the issues page of their code repository.