Subscription Only ?

Is that now all Fakku's stuff change to Subs Only ?
And are there any one-time full payment ?

The books found at https://store.fakku.net/manga-doujinshi are one time payment.

The subscription is monthly, but you gain access to current and previous simu-published magazine chapters as long as it's active.

Pretty much if you want to read anything on this site, better shell out that dough.

Whether it's worth it is up to you, but basically no free stuff on this site anymore (at least at the moment).