I buy everything I can on GoG due to lack of DRM. If something is not on GoG, I buy from Epic simply because they pay a bigger share to developers than Steam. When I buy a game I want that money go to the devs, not middlemen.

GoG also integrates well with Epic, so I can have all my games there.

This has always been the case. When Windows XP came out people hated it needed 64MB (not GB) of RAM, because that was more than the entire disk installation of Windows 95, which was also bloated compared to older Macs and Amigas.

Epic sponsoring Godot was a 4D chess move against Unity.

https://godotengine.org/article/godot-engine-was-awarded-epic-megagrant/

Only signed overflow. size_t is unsigned.

I don’t know about C++, but in Rust the push is inline, and still doesn’t always optimize checks away due to an annoying edge case: integer overflow. Reserving (old_len + new_len) could give you a smaller buffer than new_len. The optimizer sees it and is pedantic about it.