5 Accounts Connected: (Note: Banned shown in red / Inactive in Blue / Active profile (in ordinary link colour))

kamrul50, mdmamun, Lrshohag, kakamrul, mrmamun,

Proof:

Two alts kamrul50 and kakamrul were identified in June as having claimed from the same giveaway:

Quote from: sabotag3x on June 18, 2020, 07:28:08 PM

kamrul50 & kakamrul
Evidence 1, Evidence 2
Eth address: 0x71cF5413C0a0525681071726DE7c21E5059c2f04

So we turn our attention to this giveaway: [Merit] Hey Newbies! Can You Sign A Message?

Quote from: kamrul50 on October 06, 2020, 05:37:56 PM

Address: 1JfwN1qFD1BSqBzEbNm4EunDCnfSn8brGD
Message: I am kamrul50. I can sign a message.
Signature: ILqVeLU7yAAm6siIYj2i/Czk7IwKGzbzBxAVvcnJkRNEMYj8E4m5gioW8pwSjzl710/b0qFSHU4DBJfOBOme1ls=

Bit rich claiming from the same giveaway two days in a row:

( kamrul50 ) hibernates between 02 July 2019, 02:50:19 don't post again until 25 January 2020, 13:46:53 change their password then in the next two weeks three users register, are also from Bangladesh and also claim from this campaign. (not to mention the negative feedback trust for having multiple alts)

2/4/2020 5:28:31 PM    password changed kamrul50

Post 129   05 February 2020, 03:29:25 Date Registered:    Lrshohag
Post 88      19 February 2020, 16:06:37 Date Registered:   kakamrul   - Bhurungamari, Kurigram, Bangladesh (male)
Post 114   23 February 2020, 02:05:45 Date Registered:    mrmamun      - Bangladesh (male)

One of kamrul50 alts is amongst those who are claiming in the give away thread:

Quote from: kakamrul on September 28, 2020, 09:27:48 AM

-----BEGIN BITCOIN SIGNED MESSAGE-----
I’m kakamrul and I can sign a message.
-----BEGIN BITCOIN SIGNATURE-----
Version: MultiBit HD (0.1.1)
Comment: https://multibit.org
Address: 12wHM7Vsi4dMfqkaThBmKqom29kv1x5AAS

H1l2FRlSzMPSs/FE4HXkpe7nvSdJJxp32OdjXnHAF+efSrdpcxu7bIvHOKLHvp8Er7wU6RughuP8yyYbQ10ewCw=
-----END BITCOIN SIGNATURE-----

mrmamun was also identified as having an alt in that same thread/post started by @sabotag3x :

Quote from: sabotag3x on June 18, 2020, 07:28:08 PM

#78
mdmamun & mrmamun
Evidence 1, Evidence 2
Eth address: 0xF372448E4E9C21893278236068bEb367d0F40B4f

Conclusion:

To me it's very probable that mrmamun is an alt not just of mdmamun but of kamrul50 and kakamrul as well.

I'm also leaning towards Lrshohag being an alt as well due to the similarities in the giveaway thread and dates:

15 January 2018, 00:51:10 Date Registered:    kamrul50

17 March 2018, 00:24:03 Date Registered:    mdmamun (banned)

1/4/2019 10:03:52 PM    Changed to Archived status    Autoban user   mdmamun

02 July 2019, 02:50:19 kamrul50 does not post again until 25 January 2020, 13:46:53

1/7/2020 4:41:31 PM    woke up         mdmamun (banned)

25 January 2020, 13:46:53 kamrul50 resumes posting - first post since 02 July 2019, 02:50:19
25 January 2020, 15:09:51 Last Active:       mdmamun (banned)

2/4/2020 5:28:31 PM    password changed   kamrul50
05 February 2020, 03:29:25 Date Registered:    Lrshohag
05 February 2020, 17:42:14 2nd post by kamrul50 since resuming posting.

19 February 2020, 16:06:37 Date Registered:    kakamrul
23 February 2020, 02:05:45 Date Registered:    mrmamun

19 June 2020, 05:28:08 four alts identified.

Today at 00:21:17 Last Active:          Lrshohag
Today at 03:27:23 Last Active:          kakamrul
Today at 03:38:44 Last Active:          kamrul50
Today at 05:20:01 Last Active:          mrmamun

kakamrul and mrmamun are otherwise unconnected, yet they both claim in the same merit give away thread, are from Bangladesh, and first register within three and a half days of each-other. They are identified in the same post by @sabotag3x as each having an alt, one is banned while the others' alt also claims in this thread.

Reporting:

These alts have been reported by me in the "[Report] Ban Evasion [Requesting Admin/mod to check those and ban]" thread for ban evasion - Yes

I have marked these user's trust feedback pages with distrust

Related Addresses:

There are a great many addresses, twitter/telegram profile names which would require a more in-depth investigation at a later date.

Miscellaneous:

I would not be surprised if more of those claiming in the "Can you sign a message?" thread turn out to be alts as well.