Personally, I don't think this is a valid case of enshittifying. Products that you pay for that loses features or break or become more painful to use are enshittifying.
A free feature that stays free but requires you to make a free account (no credit card needed), I can see at least one very valid reason: if the feature heavier than a simple page (which is the case here), then it's an open door for DDOS attacks. Being able to track and ban/block the users that appear to participate in such an attack is totally valid.
The alternative is having to do captchas and the like to use those features anonymously, which is a pain both for user and for the devs/UI, and does feel more like the overall enshittification you are mentionning (even if it's a valid reason)
A free feature that stays free but requires you to make a free account (no credit card needed), I can see at least one very valid reason: if the feature heavier than a simple page (which is the case here), then it's an open door for DDOS attacks. Being able to track and ban/block the users that appear to participate in such an attack is totally valid.
The alternative is having to do captchas and the like to use those features anonymously, which is a pain both for user and for the devs/UI, and does feel more like the overall enshittification you are mentionning (even if it's a valid reason)