This whole thing is wild. Clapping started out as a spontaneous gesture early in Spanish lockdown (then became an annoying daily thing, but as we had a stricter lockdown than other European countries, options for fun were limited), and videos were widely shared internationally, so first it's mad that the UK version apparently had a founder and organiser etc...
...but Jack jumping onboard is a hilarious, desperate display of ego. Literally here the very first time it happened - and it really was very heartfelt and touching in the beginning - healthcare workers said, "thanks, we appreciate that, but please be aware that we have insufficient equipment and many of us are dying." There were Spanish memes about voting not clapping before the UK even started clapping the first time, and I'm pretty sure the UK had similar not long after, so this take is colder than a bowl of bacon porridge that's spent an hour being photographed on the porch floor.