I have all supporting evidences to what I have written below.
This company is the worst end users fraudulent ever. I bought two Adobe products from a seller on their page, and the keys provided for the two products both were fake and did not work, and I could not even register them on my Adobe account. I have had many communications with seller, and he kept sharing fake product keys and I reached no were. When I reported to G2A for the "money back guarantee", I found out that G2A is a bigger fraud company, and probably a fraud partner with the fake seller. They started by asking for a purchase prove, even though I have purchased it from them, I submitted that, then they asked to show them screenshots showing that the product key is not working, I did, then, they said I must contact adobe support and get them some additional info, which I did. Simply every reply they come up with a different request, and multiple repeated requests, and all provided, and sometime a new fake key that also does not work, then back to screenshot inquiries, and finally they came up with the most ridicules request, asking my to report the seller (who is online and God knows in which country), to my local police authorities and send them a police report and the police must confirm that this is a fraud, etc.
Basically, I have no spent months without getting my money back, and clearly they have a systematic fraud process in place to make buyers give up and stop asking for a refund after they are tired of the months of back and fourth endless cycles.
Even some of the "good review", those are fake reviews for people working for them, this is what I found after I managed to reach to a person who used to work from them and he has quit after he found out about their fraud business.