I think it's absolutely pettiness at this point, on both sides. I've lost track of the number of times I've seen a post about /e/OS on Mastodon with someone in the replies ranting about how everyone should use Graphene instead. It reminds me of the old joke about vegans.
GrapheneOS and /e/OS' goals are different - the former is about security tightening and the latter is about deGoogling. They just had a public falling out and refuse to let it go.
And yet GrapheneOS is better at everything that /e/ claims.
The e/OS/ CEO said during an interview [1] that GrapheneOS, being a security hardened product, was especially useful for p*ophiles to evade justice. This is totally unacceptable. People defending e/OS/ (and Murena, same people, just branding for devices) are either dishonest or useful idiots.
[1] https://grapheneos.social/@GrapheneOS/116353973732143171 (full interview at https://www.youtube.com/watch?v=jQV7498NRQw)