The robots did it not me (mostly), but all the videos I host and that are downloaded with GameEx automatically have been AI upscaled to HD and 60 fps. As they use a newer codec and are highly optimised they are selected to download by default and there is a new setting for this release.
The MAME arcade set is particularly good.
I provide this all for free and a free FTP service. I have no issue these being used for other frontends.
A new pinball cabinet MAME vertical set is also on the way with a higher resolution and the correct modified pixel aspect ratio..
The original videos are from the freely available MAME multimedia set by Progretta. I don't think special permission is required to use or include them with anything.