Irrespective of forum rules/T&Cs etc., the scenario described is not copyright infringement.
The obvious bit from the extracts below: "Fair dealing for criticism, review or
quotation is allowed for any type of copyright work" (my italics)
From
https://www.gov.uk/guidance/exceptions-to-copyright
Criticism, review and reporting current events
Fair dealing for criticism, review or quotation is allowed for any type of copyright work. Fair dealing with a work for the purpose of reporting current events is allowed for any type of copyright work other than a photograph. In each of these cases, a sufficient acknowledgement will be required.
As stated, a photograph cannot be reproduced for the purpose of reporting current events. The intention of the law is to prevent newspapers or magazines reproducing photographs for reporting current events which have appeared in competitor’s publications.
Sufficient acknowledgement
In relation to certain exceptions, if you are making use of that exception to copy someone else’s work it is necessary for you to sufficiently acknowledge their work. For example, where you have copied all or a substantial part of a work for the purposes of criticism or review, or where the use was for the purposes of news reporting.
However such acknowledgement is not required where it is impossible for reasons of practicality.
Fair dealing
Certain exceptions only apply if the use of the work is a ‘fair dealing’. For example, the exceptions relating to research and private study, criticism or review, or news reporting.
‘Fair dealing’ is a legal term used to establish whether a use of copyright material is lawful or whether it infringes copyright. There is no statutory definition of fair dealing - it will always be a matter of fact, degree and impression in each case. The question to be asked is: how would a fair-minded and honest person have dealt with the work?
Factors that have been identified by the courts as relevant in determining whether a particular dealing with a work is fair include:
- does using the work affect the market for the original work? If a use of a work acts as a substitute for it, causing the owner to lose revenue, then it is not likely to be fair
- is the amount of the work taken reasonable and appropriate? Was it necessary to use the amount that was taken? Usually only part of a work may be used
The relative importance of any one factor will vary according to the case in hand and the type of dealing in question.