Update: The Copernicus WMTS service seems to have issues, but WMS is still working, cf osm.wiki/Sentinel-2#Usage

Hi, there is now a WMTS server from the Copernicus programme themselves (https://documentation.dataspace.copernicus.eu/APIs/SentinelHub/OGC/WMTS.html) in their new “dataspace”. You need to sign up and configure your WMTS “instance”, basically selecting the imagery (eg true_color) and some optional settings, then you can access it directly from iD, JOSM or whatever. There is a monthly limit of 10.000 requests, so I wouldn’t use it for browsing around, but it works fairly well to get up to date imagery into the editor. I tried it the following way and it worked quite well (using the instance and layer ids from the created instance): https://sh.dataspace.copernicus.eu/ogc/wmts/[INSTANCE_ID]?LAYER=[https://wiki.openstreetmap.org/wiki/Tag:LAYER_ID]&SERVICE=WMTS&VERSION=1.0.0&REQUEST=GetTile&TILEMATRIXSET=PopularWebMercator256&TILEMATRIX={z}&TILECOL={x}&TILEROW={y}