It seems instances jeff is recommending a script which blocks Mastodon instances older than 4.2
It checks for the “compatible” tag in the version (so it will skip Akkoma/Pleroma/etc) and it checks if it looks like Pixelfed, but none of its checks capture GoToSocial, so.. congrats GTS users, apparently you might no longer have to deal with Jeff and his instances any more!
Also it relies on /api/v2/instance so it doesn’t work on Mastodon versions older than 4.0 which is kinda funny (It treats them as fine)