Yeah that makes sense.I have to say this is the first time I have seen that happen, all of the previous F1 games were available to buy on the store (and on sale many times - I know because this is when I bought them) so it's a surprise to see they've now removed F1 2015/16/17/18/19.
Checked and it seems the reason for the removal is EA will not pay F1 for renewal of the old licenses like Codemasters were doing yearly so the only way to get those games now is through retail stores if they have used/new copies left!
This policy change appears to have only happened this year in February.
EA dont pay for more then they have too. cough Never have cough