Je viens d'avoir environ 38 comptes et publications de bots s'inscrire et spammer en l'espace de 30 minutes

[schneeland]

Have you checked if they coming from the same region? If so, you might be able to block at least some of them (assuming you don’t have regular users in that part of the world), either using the geo-blocking plugin or directly with something like geoip-shell.