There have been multiple accounts created with the sole purpose of posting advertisement posts or replies containing unsolicited advertising.

Accounts which solely post advertisements, or persistently post them may be terminated.

verdigris ,

Okay, yes, those are all valid places to put commas, good job – except for the one after “So”, which actually decreases the legibility. It would be better to surround “for example” with commas.

However, none of them are grammatically necessary. The original comment is totally fine and can be parsed unambiguously as-is. I would support the colon insertion above any of your commas.

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