It's not necessarily an issue—I am for now happy to have the badge/link on my repo.
I would have been less suspicious if the messaging had been more straightforward (e.g. "Hey, we're seeing if some projects we like would be interested in adding a repl.it badge to their READMEs."). As it was, the PR initially sounded like something personalized, directed toward me—but then I go and find the exact message being sent to others, which activates my suspicion.
Anyways, I hope the PRs are not annoying -- it certainly cool to be able to run under game quickly (I scored 97 https://imgur.com/a/HHMMXAY)