I think I've signed 2. One was about the Online "Safety" Act, which obviously had nothing happen off the back of it.

The other was to do with political donations. This one as far as I can tell had a couple of things come from it:

https://petition.parliament.uk/petitions/707189#main-content

And even if nothing came from it, it was interesting to follow. It was a couple of years ago now but I think I recall they were talking about Russia's influence with Brexit.

Sadly the corrupt are just going to find loopholes, like receiving a £5 million personal donation to pay for their security...