UsernameRaidMonitor.cs

using System;
using System.Threading.Tasks;
using CompatBot.Utils;
using DSharpPlus;
using DSharpPlus.EventArgs;

namespace CompatBot.EventHandlers;

public static class UsernameRaidMonitor
{
    public static async Task OnMemberUpdated(DiscordClient c, GuildMemberUpdateEventArgs args)
    {
        try
        {
            //member object most likely will not be updated in client cache at this moment
            string? fallback;
            if (args.NicknameAfter is string name)
                fallback = args.Member.Username;
            else
            {
                name = args.Member.Username;
                fallback = null;
            }

            var member = await args.Guild.GetMemberAsync(args.Member.Id).ConfigureAwait(false) ?? args.Member;
            if (NeedsKick(name))
            {
                await args.Member.RemoveAsync("Anti Raid").ConfigureAwait(false);
            }
        }
        catch (Exception e)
        {
            Config.Log.Error(e);
        }
    }

    public static async Task OnMemberAdded(DiscordClient c, GuildMemberAddEventArgs args)
    {
        try
        {
            var name = args.Member.DisplayName;
            if (NeedsKick(name))
            {
                await args.Member.RemoveAsync("Anti Raid").ConfigureAwait(false);
            }
        }
        catch (Exception e)
        {
            Config.Log.Error(e);
        }
    }

    public static bool NeedsKick(string displayName)
    {
        displayName = displayName.Normalize().TrimEager();
        return displayName.Equals("D𝗂scord");
    }

}