The core team pushed a demo block with a op_return much larger than the 80 limit as part of their argument for dropping the mempool limits.

nostr:nprofile1qqs8yy57wxaj3vxppgkdkcmyjdnsflgcldgc77539xeec0rxqyfnetcpzamhxue69uhhyetvv9ujumn0wd68ytnzv9hxgtc7hfptt post history. Jameson Lopp, not tagged because I don't feel he is arguing in good faith, bragged about it in his timeline.

Yes. But it's nuanced. It will definitely lead to increased spam just because of how much easier it makes it. But there are consequences to not doing it too and they are likely worse over the long term.