We autoselect "purchase for download" for OTOTOY URLs but we do not actually validate them in any way (so it's currently perfectly possible to add release links to artists or whatnot). We should probably change that. 

From the description of MBS-12991:

releases:

• https://ototoy.jp/_/default/p/1136084
• https://ototoy.jp/_/default/p/42587
• https://ototoy.jp/_/default/p/24820

artists:

• https://ototoy.jp/_/default/a/1064270
• https://ototoy.jp/_/default/a/47834
• https://ototoy.jp/_/default/a/112

labels:

• https://ototoy.jp/labels/695414
• https://ototoy.jp/labels/96949