And if I correctly understand, Bitcoin core only uses 512MB ram for the UTXO set the rest is stored on the ssd and fetched if needed. I do not see a problem with ram or disk space unless the number of those transactions will rise considerably.

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With op_return, the utxo set does not grow at all. With pubkey data, it will grow forever.

Yes if there will be a significant amount of those transactions which is doubtable as there are cheaper ways (exploiting SegWit).